The Popular Democratic Union (Portuguese: União Democrática Popular, pronounced [uniˈɐ̃w dɨmuˈkɾatikɐ pupuˈlaɾ], or UDP) is a Marxist political movement in Portugal. The UDP transformed itself into a political association at its 15th congress due to its merger with other left-wing parties in the Left Bloc.

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Popular Democratic Union União Democrática Popular
Abbreviation	UDP
President	Mário Durval[1]
Founded	1 December 1974 (1974-12-01)[2] 3 April 2005 (2005-04-03)[3]
Dissolved	3 April 2005 (2005-04-03)[4]
Merger of	CARP (ML) URML CCR (ML)
Merged into	Left Bloc
Headquarters	Rua de São Bento, 698, Lisboa, Portugal 1250-223[5]
Newspaper	A Comuna
Ideology	Marxism Socialism
Political position	Left-wing
Colours	Red
Website
www.udp.pt
Politics of Portugal Political parties Elections

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The party was founded in December 1974 as a common mass front of the Committee for Support to the Reconstruction of the Party (Marxist–Leninist) (CARP(ML)), Revolutionary Marxist–Leninist Unity (URML) and Revolutionary Communist Committees (Marxist–Leninist). UDP ran lists in the first free election in Portugal in 1975, and elected one MP in that election. UDP also ran in the subsequent elections until 1983. After that it ran integrated in the electoral lists of the Portuguese Communist Party until 1991.

In 1998 it became part of the Left Bloc after a merger with other small left-wing parties and movements, the Revolutionary Socialist Party, Politics XXI and the Left Revolutionary Front.

The president of People's Democratic Union is Joana Mortágua, who became leader in 2010 at the age of 24. Joana Mortágua was Left Bloc candidate in the national legislative elections of 2009, electoral district of Évora^[6] and is member of the current Political Commission of Left Bloc.^[7]