Norman John Klugmann (27 February 1912 – 14 September 1977), also known as James Klugmann or James Klugman, was a British Jewish Communist and covert Soviet agent.
Klugmann was the son of a prosperous Jewish merchant. He was a leader in the European Communist youth movement in the 1930s. Later, he became a member of the executive committee of the Communist Party of Great Britain and editor of Marxism Today.
Leftist Wikipedia in its summary only describes him as "a leading British Communist writer who became the official historian of the Communist Party of Great Britain", but later in the text admits that "He was a Soviet agent and talent-spotter who was instrumental in recruiting the Cambridge Five", a ring of spies in the United Kingdom that passed information to the Soviet Union during World War II and was active from the 1930s until at least into the early 1950s.
During WWII, he was an intelligence and coordinating officer, reaching the rank of major, who by fabricating intelligence information was of a major importance in convincing Winston Churchill into supporting Tito's Communist "Partisans" rather than anti-Communists such as Draza Mihailovic who also fought against the Germans, contributing to the Communists in the postwar period establishing a Communist dictatorship in Yugoslavia. American intelligence, less impressed by Tito, wanted to continue to support non-Communists, but Churchill rejected this. "It turns out that Mihailovic's Home Army vastly outnumbered the Partisans, who, with a view toward post-war politics, fought most of their battles against Mihailovic, not the Axis occupation forces. The Partisans deliberately provoked retaliatory strikes on peaceful villages, by slipping into areas, killing a few Axis soldiers, and then stealing away. Villages "liberated" by Tito's thugs often endured a reign of terror. Many Yugoslavs felt better off under Axis control. [...] it is doubtful if Tito's forces killed as many as 5,000 Germans before the Red Army stormed into the country in October 1944. [...] The author discloses that in March 1943 Tito sent a delegation to German headquarters at Sarajevo proposing a truce so that they could both concentrate against the Home Army. Additionally, Tito promised to fight against the British should they land troops in Yugoslavia."
- The Web of Disinformation: Churchill's Yugoslav Blunder https://codoh.com/library/document/the-web-of-disinformation-churchills-yugoslav/en/