Guenter Lewy is a German-born American author and political scientist who is a professor emeritus of political science at the University of Massachusetts Amherst. His works span several topics, but he is most often associated with his 1978 book on the Vietnam War, America in Vietnam, and several controversial works that deal with the applicability of the term genocide to various historical events, where Lewy denies both the Romani genocide and the Armenian genocide.

The Viet Cong was an epithet and umbrella term to call the communist-driven armed movement and united front organization in South Vietnam, Laos and Cambodia. Formally organized as and led by the National Liberation Front of South Vietnam, it fought under the direction of North Vietnam against the South Vietnamese and United States governments during the Vietnam War. The organization had both guerrilla and regular army units, as well as a network of cadres who organized and mobilized peasants in the territory the Viet Cong controlled. During the war, communist fighters and some anti-war activists claimed that the Viet Cong was an insurgency indigenous to the South that represented the legitimate rights of people in South Vietnam, while the U.S. and South Vietnamese governments portrayed the group as a tool of North Vietnam. It was later conceded by the modern Vietnamese communist leadership that the movement was actually under the North Vietnamese political and military leadership, aiming to unify Vietnam under a single banner.