Jean Poperen was a French politician.

Poperen joined the Communist Party

French Communist Party

The French Communist Party is a political party in France which advocates the principles of communism.Although its electoral support has declined in recent decades, the PCF retains a large membership, behind only that of the Union for a Popular Movement , and considerable influence in French...

 (PCF) at 18, and was also a member of the Union of Communist Students

Union of Communist Students

The Union of Communist Students is a French student political organization, part of the Mouvement Jeunes Communistes de France . It was originally founded in 1939 but dissolved after World War II. The UEC was re-created in 1956, along with the MJCF. It is independent from the French Communist...

. He left the PCF after the Hungarian Revolution of 1956 and became a founding member of the Unified Socialist Party

Unified Socialist Party (France)

The Unified Socialist Party was a socialist political party in France, founded on April 3, 1960. It was originally led by Édouard Depreux , and by Michel Rocard .- History :...

 (PSU) in 1960. Disagreeing with the PSU's party line, he founded the Union of Socialist Groups and Clubs

Union of Socialist Groups and Clubs

The Union of Socialist Groups and Clubs was a socialist club in France led by Jean Poperen after he was expelled from the Unified Socialist Party. The UGCS joined the Federation of the Democratic and Socialist Left before merging into the new PS at the Issy-les-Moulineaux Congress....

 (UGCS). The UGCS participated in the Federation of the Democratic and Socialist Left

Federation of the Democratic and Socialist Left

The Federation of the Democratic and Socialist Left was a conglomerate of French left-wing non-Communist forces. It was founded to support François Mitterrand's candidature at the 1965 presidential election and to couter-balance the Communist preponderance over the French left...

 and joined the new Socialist Party

Socialist Party (France)

The Socialist Party is a social-democratic political party in France and the largest party of the French centre-left. It is one of the two major contemporary political parties in France, along with the center-right Union for a Popular Movement...

 at the party's second national congress

Issy-les-Moulineaux Congress

The Issy-les-Moulineaux Congress was the second national congress of the French Socialist Party . It took place on July 11 to 13, 1969. This marked the transformation of the old French Section of the Workers' International into the new PS...

.

Poperen, a member of the party's left-wing, was the party's second-in-command from 1981 to 1987. Poperen also served in the Michel Rocard

Michel Rocard

Michel Rocard is a French politician, member of the Socialist Party . He served as Prime Minister under François Mitterrand from 1988 to 1991, during which he created the Revenu minimum d'insertion , a social minimum welfare program for indigents, and led the Matignon Accords regarding the status...

 government, and was PS deputy for the Rhône from 1973 to 1988.