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Socialist Workers Front (Marxist–Leninist)
Frente Obrero Socialista (marxista-leninista)
Founded1973
Dissolved1980
Split from PPP
NewspaperRed Flag
Ideology
Political position Far-left

Socialist Workers Front (Marxist–Leninist) ( Spanish: Frente Obrero Socialista (marxista-leninista)) was a communist party in Panama. FOS(ml) was founded in 1973, following a split in the People's Party of Panama. FOS(ml) originated in the pro-Chinese 'Proletarian Wing' of PPP. FOS(ml) made its first public appearance on May Day 1973.

FOS(ml) was mainly active in the students movement. It also organized the AsociaciĂłn de Amistad con la RepĂșblica Popular China. FOS(ml) published Bandera Roja (Red Flag) 1974–1980.

The general secretary of FOS(ml) was Enrique Castillero.

In 1980, FOS(ml) was dissolved following internal strife. One section would live on as the Communist Party (Marxist-Leninist) of Panama.