After Fidel Castro's revolutionary government seized the assets of Trafficante's Cuban businesses and expelled him from the country as an "undesirable alien," Trafficante came into contact with various US intelligence operatives, and was involved in several unsuccessful plans to assassinate Castro. In 1975, the CIA declassified a report stating that Trafficante had been persuaded to poison Castro, an allegation he denied. In 1997, further declassified documents indicated that some "mafiosi" worked with the agency on assassination attempts against Castro. Allusions to these historic connections were confirmed by the CIA's 2007 declassification of the "Family Jewels" documents.