It was founded on 19 April 1973 in the German city of Bad Münstereifel, by militants from the Portuguese Socialist Action (Portuguese: Acção Socialista Portuguesa).
Didirikan pada tanggal 19 April 1973 di kota Bad Münstereifel di Jerman oleh militan Gerakan Sosialis Portugal (bahasa Portugis: Acção Socialista Portuguesa).