 Cancel Miranda was a model prisoner and in 1960, after six years on Alcatraz, he was transferred to Leavenworth.Cancel Miranda spent 10 years in Leavenworth.In 1970, together with fellow Nationalists Andrés Figueroa Cordero (he was transferred from the federal penitentiary in Atlanta), Irvin Flores Rodríguez and Oscar Collazo, he started a strike and stopped working because of the abuses by some of the guards against them.