Viola June Cobb (August 24, 1927 – October 17, 2015) was an American informant for the CIA. She worked at Fidel Castro's headquarters in Havana as a translator and public relations worker in 1959 and 1960. After leaving Cuba, Cobb continued working for the CIA in Guatemala and Mexico. She was the first CIA asset to relay an account of Lee Harvey Oswald having attended a twist party in Mexico City weeks before the assassination of John F. Kennedy. Earlier in the 1950s, Cobb was involved with the production and trafficking of narcotics with her Colombian fiancé and his twin brother. She later provided information to the US Federal Bureau of Narcotics that led to arrests in Cuba and Colombia.