The United Labour Social Democratic Party (Обединена работническа социалдемократическа партия, Obedinena rabotnicheska sotsialdemokraticheska partiya, ORSDP) was a political party in Bulgaria.
History The party was established as a breakaway from the Bulgarian Social Democratic Workers' Party (Broad Socialists) following the 1923 coup, and was initially allied with the Democratic Alliance.Nohlen, D & Stöver, P (2010) Elections in Europe: A data handbook, p374
The party first contested national elections alone in 1931, when it ran in the National Assembly elections,Nohlen & Stöver, p380 but failed to win a seat.Nohlen & Stöver, p386
Between 1945 and 1947 the ORSDP was allied with Bulgarian Agrarian People's Union "Nikola Petkov", with the parties running a joint list in the 1946 Constitutional Assembly election. The joint list finished in second place with 101 seats.Nohlen & Stöver, p376 The following year a Communist regime was established.Nohlen & Stöver, p355
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