The Popular Unitary Action Movement or MAPU (Spanish: Movimiento de Acción Popular Unitario) was a small leftist political party in Chile. It was part of the Popular Unity coalition during the government of Salvador Allende. MAPU was repressed during the dictatorship of Augusto Pinochet. In this period, some of its most radical members formed the Movimiento Juvenil Lautaro, whose leaders were political prisoners during the dictatorship and with the return to democracy. Another faction of the former members of the party joined the social democratic Party for Democracy in 1987.