The chairman of the party was Ilie Verdeţ, former Communist Prime Minister between 1979 and 1982, under Secretary General Nicolae Ceaușescu.

[2] At the 1992 general election, the party obtained roughly 3% of votes and thus entered the parliament.

Together with the Greater Romania Party (PRM), the PSM formed the "National Bloc" faction in the Romanian Senate.

The PSM participated in the so-called Red Quadrilateral coalition that included Iliescu's Democratic National Salvation Front (FDSN), the Greater Romania Party (PRM; at that time national communist), the Agrarian Democracy Party (PDAR), and the nationalist Romanian National Unity Party (PUNR).

[3] Later, the Socialist Party of Labour (PSM) gradually lost its influence.