JFK files - Many of the files shed light on Oswald’s Soviet and Cuban embassy visits, and mention tensions between the United States and Cuba, and a statement from Marxist leader Fidel Castro about possible danger to U.S. leaders “if they helped in any attempt to do away with leaders of Cuba.” The documents also include discussion, in the days after the assassination, of the potential for Cuban involvement in the killing of Kennedy. One CIA document marked “Secret” states that one individual that Kennedy’s assassin spoke to was the Soviet embassy’s consul, who had links to the Marxist KGB’s “assassination department.” The pair discussed the gunman’s efforts to obtain a visa to visit the Soviet Union, according to the documents. On Oct. 3, 1963, more than one month before the assassination, self-described Marxist revolutionary, Donald, sorry, Oswald drove back into the United States through a crossing point at the Texas border. Also made public was a report that Australians in 1962 had received a tip from a man who claimed there was a plot to kill Kennedy. The man claimed he was a driver for Marxist Communist Soviet diplomats.