La revolución en los volcanes

the long version

"Attempts to dispel the 'black legend' that regional leaders Domingo and Cirilo Arenas betrayed the principles of the Plan of Ayala by switching to Carranza in 1917, a move that led to the killing of Domingo by the Zapatistas. Cirilo, in turn, was executed in 1920 by Carrancista officials. Operating primarily in Tlaxcala, the brothers maintained their commitment to agrarian reform throughtout their revolutionary careers"--Handbook of Latin American Studies, v. 58.