Chapter Two examines efforts by the FBI, CIA, local law enforcement, and U.S. politicians to portray travel to Cuba by American dissidents as a threat to U.S. national security. Alleging covert Cuban involvement in left-wing political bombings, espionage, street demonstrations, and growing interest in socialism among the American public, U.S. officials claimed that Cuba’s support for American radicals posed an internal security threat. Lurid media coverage focused on the Venceremos Brigade and Black Panther Party, which were accused of violating the U.S. travel ban to Cuba to receive training in guerrilla warfare from Fidel Castro’s government. The imagined perils of contact between Cuba’s revolutionaries and American radicals, however, lay in their ideological, not military, potentials. In 1976, the FBI summed up a decade of investigations, concluding that the communist nation had been the single greatest foreign influence on domestic radicalism during the 1960s.