In 1928 former President Obregón was assassinated by a right-wing Roman Catholic associated with the Cristero movement. While neither CROM nor its leader, Luis Morones, had any connection to the crime, Calles (who was about to finish his term of office and to begin his run as éminence grise behind the presidency in the period known as El Maximato) considered Morones the intellectual author of the assassination because he had denounced Obregón's plans to amend the constitution to allow himself to serve another term as President of Mexico. Obregón's successor, Emilio Portes Gil – a forced ally of Calles due to the upheaval created by Obregón's assassination – fired CROM officials from their government posts and threw the government's support to rival union groups, such as the Confederación General de Trabajadores, (CGT), a nominally anarchist group, and the Confederación Sindical Unitaria de México, a group associated with the Mexican Communist Party (PCM). The CROM began to disintegrate once it lost state support.