This article is the first in-depth study of Cuba's revolutionary news agency, Prensa Latina. Drawing on a wide variety of archival and published sources, including Cuban media and memoirs, declassified intelligence reports, U.S. State Department records, and newspaper articles from across Latin America, the article analyzes the agency's controversial creation, international reception, and significance. The evidence presented here shows that Prensa Latina was a powerful weapon in Fidel Castro's revolutionary arsenal because it provided a way for the Cuban government to gather and shape information and garner international support. Studying the history of Prensa Latina provides new insight into the production, circulation, reception, restriction, and manipulation of information during the Cold War. The Cuban agency's efforts to reshape the international flow of information posed a clear challenge both to the traditional media and to Castro's enemies across the Americas, spurring them to pursue a wide variety of tactics to silence Prensa Latina.