The Montonero Peronist Movement (Spanish: Movimiento Peronista Montonero) was an Argentine left-wing Peronist guerrilla group, active during the 1970s. Its motto was venceremos ("we will win"). After Juan Perón's return from 20 years of exile and the June 20, 1973 Ezeiza massacre, which marked the definitive split between left and right-wing Peronism, the Montoneros were expelled from the Justicialist party in May 1974 by Perón.