Movement for a Socialist Alternative (MSA), ISA in Nigeria, is a militant Marxist organization. It is continuing decades of involvement in the workers’ movement and struggle for socialist transformation, since the days of the military dictatorship, when originally its predecessor organization was founded in 1986. It is a participant in the Socialist Party of Nigeria (SPN), launched in 2013, as a political alliance aimed at advancing the building of a working-class based political alternative at the national level.