The Corsican mafia is a set of criminal groups originating from Corsica. The mafia is closely tied to both the French underworld and the Italian Mafia. The Corsican mafia is an influential organized crime structure operating in France, Russia, and many African and Latin American countries. The pre-war crime bosses of Marseille, Paul Carbone and François Spirito, collaborated closely with the Milice in Vichy France and the Nazi Gestapo in Occupied France. Also, during World War II, the Corsican mafia led by the Guerini brothers (Antoine and Barthélémy, nicknamed "Mémé") sided with the anti-communist SFIO faction within the French Resistance. In 1947, Marseille was the main trading port of the French colonial empire and it had a Marxist-Leninist mayor, Jean Christofol, who was backed by the labour unions for longshoremen, transportation workers, and dockworkers. In the coming Cold War, both the center-left French government and the US fought against Soviet influence in Marseille, while covertly employing illegal means to further that goal: the Guerini gang was employed to disrupt union and electoral gatherings, back strikebreakers and support US-funded anti-Soviet labor unions. From the 1950s to the 1960s, the Guerini brother were exempt from prosecution in Marseille. The Guerini brothers smuggled opiates from French Indochina using the Messageries Maritimes, a French merchant shipping company. From the 1960s to the early 1970s the major Corsican organized crime groups were collectively termed Unione Corse by American law enforcement. During the same era, they organized the French Connection, a massive heroin trafficking operation based in Marseille and selling to the American Mafia. The end of the French Connection caused the disbandment of Corsican clans involved in the heroin trade. However, the evolution of the Corsican Mafia has continued in several illegal activities (hold-ups, racketeering, casinos, illegal slot machines, various drug dealing and prostitution).