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Socialist Movement of the Senegalese Union (in French: Mouvement Socialiste d'Union Sénégalaise) was a splinter-group of French Section of the Workers' International (SFIO) in Senegal. MSUS appeared in 1956 and merged into the Senegalese Popular Bloc (BPS).
Source: Nzouankeu, Jacques Mariel. Les partis politiques sénégalais. Dakar: Editions Clairafrique, 1984.
References
Socialist Movement of the Senegalese Union Wikipedia(Text) CC BY-SA