Alpha 66 is a paramilitary group, forme by Cuban exiles in Puerto Rico opposed to the Cuban government led by Fidel Castro in 1961. The founder and first leader, Nazario Sargen, was a former member of the 26th of July Movement organization lead by Fidel Castro, suggesting that their politics may have been left-wing. The group trained during the 1960s and 1970s in the Everglades for an eventual armed invasion of Cuba. The Cuban government has long considered the group to be a terrorist organization.