The colonial wars and the French economy's dependence on immigrant labour during the "Trente Glorieuses", extending from 1945 to 1974, changed the positions of the struggle against a racism that began to take various forms. The MRAP supported anti-colonialism and was opposed to the Algerian War (1954–62). It was one of the rare organizations to condemn the methods of the police prefect Maurice Papon and the Paris massacre of 1961.