In November 1964 a military coup in Bolivia overthrew the bourgeois government of the MNR (whose vice president was the bureaucrat of COB, Juan Lechin). A few months later, in September 1965, Moreno wrote to Hugo González Moscoso, leader of the POR-Combate, related to the sector of the Fourth International led by Mandel and Pierre Frank, to point out some discrepancies about the orientation of POR-Combate. Subsequently, the letter was reproduced in several publications. In particular, in 1973, Moreno quoted it extensively in its controversy against Mandel and the guerrilla deviation. See The Party and the Revolution on this page. We reproduce the text of Revista de América Nº 6/7, from July / October 1971.