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In page Túpac Amaru Revolutionary Movement:

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The MRTA formed between 1980-1982 with merging of the Revolutionary Socialist Party - Marxist-Leninist (PSR-ML) and the militant faction of the Revolutionary Left Movement, MIR El Militante (MIR-EM).[1] The former gathered several ex-members of the Peruvian armed forces that participated in the leftist government of Juan Velasco Alvarado (1968–1975), and the latter represented a subdivision of the Revolutionary Left Movement, a Castroist guerrilla faction which was defeated in 1965. The MRTA attempted to ally with other leftist organizations following the first democratic elections in Peru after a military government period (1968–1980). in the Period of 1982-1984, the MRTA continued to organize its military and political structures internally.[1]