Marzani traveled to Europe and the Soviet Union in September 1960, returning to New York in January. He was working on a Spanish translation of "We Can Be Friends" for publication in Cuba. Cuba's UN delegation arranged for him to visit Havana the following month. While he was there, Cedric Belfrage, a British friend from Marzani's OSS days, introduced him to Jacobo Árbenz, the former President of Guatemala overthrown by the CIA in 1954. Another OSS friend arranged a meeting with Che Guevera, with whom Marzani anticipated a US invasion of Cuba, six weeks before the US-financed, US-directed Bay of Pigs Invasion. These experiences provided background for "Cuba versus CIA", cowritten with Robert E. Light, an associate editor with Belfrage's newspaper, the "National Guardian". This book was one of the first to list major covert CIA operations, including against Guatemala, and overthrowing the Mossadegh government in Iran in 1953.