The "Rivers of Blood" speech was made by the British politician Enoch Powell on 20 April 1968 to a meeting of the Conservative Political Centre in Birmingham. In it, Powell, who was then Shadow Secretary of State for Defence in the Shadow Cabinet of Edward Heath, strongly criticised the rates of immigration from the Commonwealth of Nations (mostly former colonies of the British Empire) to the United Kingdom since the Second World War. He also opposed the Race Relations Bill, an anti-discrimination bill which upon receiving royal assent as the Race Relations Act 1968 criminalised the refusal of housing, employment, or public services to persons on the grounds of colour, race, or ethnic or national origin. Powell himself called it "the Birmingham speech"; "Rivers of Blood" alludes to a prophecy from Virgil's Aeneid that Powell (a classical scholar) quoted:

The speech was a national controversy, and it made Powell one of the most talked-about and divisive politicians in Britain. Heath, the leader of the Conservative Party at the time, dismissed him from the Shadow Cabinet the day after the speech. According to most accounts the popularity of Powell's views on immigration might have been a decisive factor in the Conservative Party's unexpected victory at the 1970 general election, although he became one of the most persistent opponents of the subsequent Heath ministry.

Background Powell, the member of Parliament (MP) for Wolverhampton South West and Shadow Secretary of State for Defence for the Conservative Party, was addressing the general meeting of the West Midlands Area Conservative Political Centre. The Labour government's 1968 Race Relations Bill was to have its second reading three days later, and the Conservative Opposition had tabled an amendment significantly weakening its provisions. The bill was a successor to the Race Relations Act 1965.

The Birmingham-based television company ATV saw an advance copy of the speech on the Saturday morning, and its news editor ordered a television crew to go to the venue, where they filmed sections of the speech. Earlier in the week, Powell had said to his friend Clem Jones, a journalist and then editor at the Wolverhampton Express & Star, "I'm going to make a speech at the weekend and it's going to go up 'fizz' like a rocket; but whereas all rockets fall to the earth, this one is going to stay up." Jones's son Nicholas, condensed from book What Do We Mean by Local? The Rise, Fall – and Possible Rise Again – of Local Journalism (Abramis, 2013).

In preparing his speech, Powell had applied Jones's advice that to make hard-hitting political speeches and short-circuit interference from his party organisation, his best timing was on Saturday afternoons, after delivering embargoed copies the previous Thursday or Friday to selected editors and political journalists of Sunday newspapers. This tactic could ensure coverage of the speech over three days through Saturday evening bulletins, then Sunday newspapers, thus the coverage would be picked up in Monday newspapers.

Powell's critics suspected he fabricated some of his stories. In later years, the veracity of elements of the speech – namely, within the story about the widow – have been questioned, with the Express & Star claiming evidence suggests "the most controversial speech in post-war British politics was a web of lies, involving a vulnerable, mentally-ill woman, Druscilla "Trudy" Cotterill".

Speech In the speech, Powell recounted a conversation with one of his constituents, a middle-aged working man, a few weeks earlier. Powell said that the man told him: "If I had the money to go, I wouldn't stay in this country... I have three children, all of them been through grammar school and two of them married now, with family. I shan't be satisfied till I have seen them all settled overseas." The man finished by saying to Powell: "In this country in 15 or 20 years' time the black man will have the whip hand over the white man".

Powell said:

Powell quoted a letter he received from a woman in Northumberland, about an elderly woman living on a Wolverhampton street where she was the only white resident. The woman's husband and two sons had died in the Second World War and she had rented out the rooms in her house. Once immigrants had moved into the street in which she lived, her white lodgers left. Two black men had knocked on her door at 7:00 am to use her telephone to call their employers, but she refused, as she would have done to any other stranger knocking at her door at such an hour, and was subsequently verbally abused. The woman had asked her local authority for a rates reduction, but was told by a council officer to let out the rooms of her house. When the woman said the only tenants would be black, the council officer replied: "Racial prejudice won't get you anywhere in this country."

Powell advocated voluntary re-emigration by "generous grants and assistance" and he mentioned that immigrants had asked him whether it was possible. He said that all citizens should be equal before the law, and that:

He argued that journalists who urged the government to pass anti-discrimination laws were "of the same kidney and sometimes on the same newspapers which year after year in the 1930s tried to blind this country to the rising peril which confronted it". Powell described what he perceived to be the evolving position of the White British population:

Powell warned that if the legislation proposed for the then–Race Relations Bill were to be passed it would bring about discrimination against the native population:

Powell was concerned about the current level of immigration and argued that it must be controlled:

Powell argued that he felt that although "many thousands" of immigrants wanted to integrate, he felt that the majority did not, and that some had vested interests in fostering racial and religious differences "with a view to the exercise of actual domination, first over fellow-immigrants and then over the rest of the population". Powell's peroration of the speech gave rise to its popular title. He quotes the Sibyl's prophecy in the epic poem Aeneid, 6, 86–87, of "Terrible war, and the river Tiber foaming / With streams of blood".

Reaction Political According to C. Howard Wheeldon, who was present at the meeting in which Powell gave the speech, "it is fascinating to note what little hostility emerged from the audience. To the best of my memory, only one person voiced any sign of annoyance." The day after the speech, Powell went to Sunday Communion at his local church, and when he emerged, there was a crowd of journalists, and a local plasterer said to Powell: "Well done, sir. It needed to be said." Powell asked the assembled journalists: "Have I really caused such a furore?" At midday, Powell went on the BBC's World This Weekend to defend his speech, and he appeared later that day on ITN news.

The Labour MP Ted Leadbitter said he would refer the speech to the Director of Public Prosecutions, and the Liberal Party leader Jeremy Thorpe spoke of a prima facie case against Powell for incitement. Lady Gaitskell called the speech "cowardly", and the West Indian cricketer Sir Learie Constantine condemned it.

The leading Conservatives in the Shadow Cabinet were outraged by the speech. Iain Macleod, Edward Boyle, Quintin Hogg and Robert Carr all threatened to resign from the front bench unless Powell was dismissed. Margaret Thatcher, who was then the Shadow Cabinet's Fuel and Power Spokesman, thought that some of Powell's speech was "strong meat","Part 2: Enoch Powell and the 'Rivers of Blood Ottawa Citizen (Canada.com), 4 June 2008 and said to the Conservative leader, Edward Heath when he telephoned her to inform her Powell was to be sacked: "I really thought that it was better to let things cool down for the present rather than heighten the crisis". Heath dismissed Powell from his post as Shadow Defence Secretary, telling him on the telephone that Sunday evening. They never spoke to each other again. Heath said of the speech in public that it was "racialist in tone and liable to exacerbate racial tensions". Conservative MPs on the right of the party—Duncan Sandys, Gerald Nabarro, Teddy Taylor—spoke against Powell's sacking. On 22 April 1968 Heath went on Panorama, telling Robin Day: "I dismissed Mr Powell because I believed his speech was inflammatory and liable to damage race relations. I am determined to do everything I can to prevent racial problems developing into civil strife ... I don't believe the great majority of the British people share Mr Powell's way of putting his views in his speech."

The Times declared it "an evil speech", stating "This is the first time that a serious British politician has appealed to racial hatred in this direct way in our postwar history."Editorial comment, The Times, 22 April 1968 The Times went on to record incidents of racial attacks in the immediate aftermath of Powell's speech. One such incident, reported under the headline "Coloured family attacked", took place on 30 April 1968 in Wolverhampton itself: it involved a slashing incident with 14 white youths chanting "Powell" and "Why don't you go back to your own country?" at patrons of a West Indian christening party. One of the West Indian victims, Wade Crooks of Lower Villiers Street, was the child's grandfather. He had to have eight stitches over his left eye. He was reported as saying, "I have been here since 1955 and nothing like this has happened before. I am shattered."The Times, 1 May 1968 An opinion poll commissioned by the BBC television programme Panorama in December 1968 found that eight per cent of immigrants believed that they had been treated worse by white people since Powell's speech, 38 per cent would like to return to their country of origin if offered financial help, and 47 per cent supported immigration control, with 30 per cent opposed.

The speech generated much correspondence to newspapers, most markedly with the Express & Star in Wolverhampton itself, whose local sorting office over the following week received 40,000 postcards and 8,000 letters addressed to its local newspaper. Jones recalled:

At the end of that week there were two simultaneous processions in Wolverhampton, one of Powell's supporters and another of opponents, who each brought petitions to Jones outside his office, the two columns being kept apart by police.

On 23 April 1968 the Race Relations Bill had its second reading in the House of Commons. Many MPs referred or alluded to Powell's speech. For Labour, Paul Rose, Maurice Orbach, Reginald Paget, Dingle Foot, Ivor Richard and David Ennals were all critical. Among the Conservatives, Quintin Hogg and Nigel Fisher were critical, while Hugh Fraser, Ronald Bell, Dudley Smith and Harold Gurden were sympathetic. Powell was present for the debate but did not speak.

Earlier that day, 1,000 London dockers had gone on strike in protest of Powell's sacking and marched from the East End to the Palace of Westminster carrying placards with sayings such as "we want Enoch Powell!", "Enoch here, Enoch there, we want Enoch everywhere", "Don't knock Enoch" and "Back Britain, not Black Britain". Three hundred of them went into the palace, 100 to lobby the MP for Stepney, Peter Shore, and 200 to lobby the MP for Poplar, Ian Mikardo. Shore and Mikardo were shouted down and some dockers kicked Mikardo. Lady Gaitskell shouted: "You will have your remedy at the next election." The dockers replied: "We won't forget." The organiser of the strike, Harry Pearman, headed a delegation to meet Powell and said after: "I have just met Enoch Powell and it made me feel proud to be an Englishman. He told me that he felt that if this matter was swept under the rug he would lift the rug and do the same again. We are representatives of the working man. We are not racialists."