An independence referendum was held on 1 October 2017 in the Spanish autonomous community of Catalonia, passed by the Parliament of Catalonia as the Law on the Referendum on Self-determination of Catalonia and called by the Generalitat de Catalunya. The referendum, known in the Spanish media by the numeronym 1-O (for "1 October"), was declared unconstitutional on 7 September 2017 and suspended by the Constitutional Court of Spain after a request from the Spanish government, who declared it a breach of the Spanish Constitution. Additionally, in early September the High Court of Justice of Catalonia had issued orders to the police to try to prevent the unconstitutional referendum, including the detention of various persons responsible for its preparation. Due to alleged irregularities during the voting process, as well as the use of force by the National Police Corps and Civil Guard, international observers invited by the Generalitat declared that the referendum failed to meet the minimum international standards for elections.

The referendum was approved by the Catalan parliament in a session on 6 September 2017, boycotted by 52 anti-independence parliamentarians, along with the Law of juridical transition and foundation of the Republic of Catalonia the following day 7 September, which stated that independence would be binding with a simple majority, without requiring a minimum turnout. After being suspended, the law was finally declared void on 17 October, being also unconstitutional according to the Statute of Autonomy of Catalonia which requires a two-thirds majority, 90 seats, in the Catalan parliament for any change to Catalonia's status. The referendum question, which voters answered with "Yes" or "No", was "Do you want Catalonia to become an independent state in the form of a republic?". While the "Yes" side won, with 2,044,038 (90.18%) voting for independence and 177,547 (7.83%) voting against, the turnout was only 43.03%. The Catalan government estimated that up to 770,000 votes were not cast due to polling stations being closed off during the police crackdown, although the "universal census" system introduced earlier in the day allowed electors to vote at any given polling station. Catalan government officials have argued that the turnout would have been higher were it not for Spanish police suppression of the vote. On the other hand, most voters who did not support Catalan independence did not turn out, as the constitutional political parties asked citizens not to participate in the illegal referendum to avoid "validation". Additionally, numerous cases of voters casting their votes several times or with lack of identification were reported, and the counting process and the revision of the census were not performed with quality standards ensuring impartiality.

The days leading to the referendum witnessed hasty judicial fights, and the High Court of Justice of Catalonia eventually ordered police forces to impede the use of public premises for the imminent voting. With conflicting directives, the referendum mostly saw inaction of part of the autonomous police force of Catalonia, the Mossos d'Esquadra, who allowed many polling stations to open while the National Police Corps and the Guardia Civil intervened and raided several opened polling stations to prevent voting. Early figures of 893 civilians and 111 agents of the National Police and the Guardia Civil injured may have been exaggerated. According to Barcelona's judge investigating those police violence, 218 persons were injured in Barcelona alone. According to the official final report by the Catalan Health Service (CatSalut) of the Generalitat, 1066 civilians, 11 agents of the National Police and the Guardia Civil, and 1 agent of the regional police, the Mossos d'Esquadra, were injured. The United Nations High Commissioner for Human Rights, Zeid Ra'ad Al Hussein, urged the Spanish government to investigate all acts of violence that took place to prevent the referendum. The police action also received criticism from Amnesty International and Human Rights Watch which defined it as an "excessive and unnecessary use of force". Spanish Supreme Court judge Pablo Llarena stated Carles Puigdemont ignored the repeated warnings he received about the escalation of violence if the referendum was held.

Mossos d'Esquadra were investigated for disobedience, for allegedly not having complied with the orders of the High Court of Justice of Catalonia. Members of Mossos d'Esquadra under investigation included major Josep Lluís Trapero, who was investigated for sedition by the Spanish National Court. The Mossos d'Esquadra denied those accusations and said they obeyed orders applying the principle of proportionality, which is required by Spanish law in all police operations. The regional police and major Trapero were later cleared of any wrongdoing and the case against the force was dismissed.

Background

The ballot was initially scheduled for no later than 17 September 2017, a result of an election pledge made by pro-independence parties ahead of the 2015 Catalan election (during the previous legislature, the Catalan government had held a non-binding "citizen participation process" about the question).

The election resulted in a minority government for the Junts pel Sí coalition (JxSí), which had won a plurality of MPs (62 of the 135 seats), plus conditional support from the 10 CUP-CC MPs. Shortly after the government was formed, it resolved to hold a referendum on independence.

On 24 January 2017, the Government of Catalonia held a privately organised conference in one of the rooms of the European Parliament in its Brussels headquarters. The event, entitled "The Catalan Referendum", was promoted by Carles Puigdemont, President, Oriol Junqueras, Vice President, and Raül Romeva. It was attended by 500 people, among whom were MEPs, diplomats and journalists from the international media.

Organisation

The Catalan government's decree officially calling the referendum was expected to be approved in the second half of August but was approved only on 6 September.

Shortly after the referendum was announced, attention focused on the issue of the ballot boxes, since the government of Spain is in charge of providing them, whereas for this non-state-sanctioned vote, the government of Catalonia would have to put them in place, potentially risking prosecution for the misuse of public funds. It is still unclear who bought them. The Catalan government opened a bidding process to buy them but no offers were presented. Cristóbal Montoro, the Spanish Minister of the Treasury, assured that the ballot boxes were not paid for with public money and some media reported they were finally bought by an individual whose identity remains unknown.

Tendering by the Catalan government for materials such as ballot papers and envelopes for a putative regional election in the region were thought by some to be an attempt to covertly organise the referendum. On 24 March, the Spanish Public Prosecutor's Office in Catalonia had already announced an inquiry to determine whether a referendum is in the planning.

In terms of its organisation, the electoral roll is one of the main points in contention, since this is managed by the National Institute of Statistics, an autonomous organisation placed under the jurisdiction of the government of Spain. To access its data, polls must have been authorised by the Spanish Congress. Without an undisputed access to the electoral roll, the results may be deemed unreliable. Similar difficulties could be met when it comes to the electoral commission to be formed for monitoring the polling and results.

By April 2017, the Catalan government had already received 5 judicial notices warning about the criminal liabilities they were exposed to if they continued the preparation of the referendum, as the constitutional court previously declared illegal any official budget allocation.

An official announcement by the government of Catalonia suggested that Catalan residents overseas willing to vote would have to register. By the end of June 2017, out of 285,000 Catalans living abroad and eligible to vote, 5,000 had registered.

Tensions within the Catalan government

On 3 July 2017, President Puigdemont sacked his Minister for Enterprise, , who, in the face of the legal challenges, had just expressed doubts regarding the referendum taking place as envisioned by the Catalan government.

Then, on 14 July, Puigdemont proceeded with a cabinet reshuffle, replacing three additional ministers in his cabinet (the ones responsible for presidency, education, and interior) in a move widely seen as a removal of the remaining hesitant voices within his cabinet in regards to the referendum issue.

On 17 July, the chief of the Catalan police, called Mossos d'Esquadra, resigned without giving any reason. The Catalan police force is seen as key to enforcing any court orders sought by the central government challenging the secession vote.

Additional isolated resignations and dismissals have been noted among some of the high-level civil servants potentially playing a role with the vote's organisation.

Scope When the Spanish Constitutional Court suspended the law on the referendum on 7 September 2017, it forbade several Catalan office holders, the Catalan media, as well as the 948 municipalities of Catalonia to participate in the preparation of the referendum. The municipalities were instructed to reply within 48 hours whether they intended to comply or not. Out of 726 municipalities that answered, 682 announced that they would support the referendum anyway, 41 announced they would refuse to support it, and three, including the municipality of Barcelona, answered without making their intentions clear.

Among those that refused to support the referendum, however, there are large population centers, such as the provincial capitals of Lleida (140,000 inhabitants) and Tarragona (130,000 inhabitants) or the cities of Terrassa (215,000 inhabitants) and Hospitalet de Llobregat (250,000 inhabitants) governed by PSC mayors. The mayor of Barcelona, Ada Colau, while refusing to make a statement whether the municipality of Barcelona would provide logistical support to the referendum or not, strongly criticised the "language of testosterone" and the pressure that she said was being exerted on the municipalities. Nevertheless, she announced that she would do anything possible to allow those in Barcelona who wished to vote to do so.

The Catalan government financed advertisement for the referendum in the regional public television and radio, in spite of a legal notice against such actions by the High Court of Justice of Catalonia. No campaign for the No-side was organized, as no party opposing independence participated in the referendum nor wanted to legitimize it. In a few locations, fake posters with the logos of the main opposition parties and asking to vote No were reported.

Police operation to stop the referendum