Beginning in 1978 one tendency led by Moussa Kane made contact with the PAI of Majhmout Diop. On March 29 Kane and his followers joined the legal PAI.
LD founded the monthly magazine Vérité.
LD was recognized as a legal political party on July 9, 1981. After legalization it started publishing Fagaru.
In the late 1970s, LD started advocating the unification of the Marxist left in Senegal into a single party (they proposed the name Parti Sénégalais du Travail). Thus it later changed its name to LD/MPT.
The two LD/MPT ministers in the government, Yéro Deh and Seydou Sy Sall (who was Minister of Town Planning and Regional Planning),[4] were dismissed by Wade on March 9, 2005.[4][5][6] The party had become highly critical of Wade and the government, and it was accused of violating "governmental solidarity by constant, unjust and unfounded attacks against the president, his government and his party".[6] An important factor in this was the opposition of the LD/MPT to an amnesty regarding the 1993 assassination of Constitutional Council vice-president Babacar Sèye.[5][6] Prior to the dismissal of its ministers, the LD/MPT had already intended to leave the government on April 24.[6]
The party no longer identifies itself as a communist party.