sentences:  A dissident within the CROM, Marxist Vicente Lombardo Toledano, formed a rival labor confederation, the CTM in 1936, which became the mass organization of labor within the PRM.Lombardo stepped down from the leadership of the CTM in 1941, after Cárdenas left the presidency.He was replaced by Fidel Velázquez, who remained head of the CTM until his death at age 97.