The crossword solution for the term 'Amigo of Fidel' is CHE, which stands for Ernesto 'Che' Guevara, a Marxist revolutionary who was a close friend and confidant of Cuban leader Fidel Castro. Che Guevara was an Argentine-born doctor who joined Castro's Cuban Revolution in 1956 and became one of its most visible figures. He was instrumental in the Cuban Revolution's success and was later appointed as Minister of Industry. Che Guevara was also a key figure in the spread of Marxist-Leninist ideology throughout Latin America.