Col. Masanobu Tsuji was a fanatical Japanese militarist and brutal warrior, hunted after World War II for massacres of Chinese civilians. And then he became a U.S. spy. Newly declassified CIA records ... document more fully than ever how Tsuji and other suspected Japanese war criminals were recruited by U.S. intelligence in the early days of the Cold War. The records [were] declassified in 2005 and 2006 under an act of Congress in tandem with Nazi war crime-related files. In addition to Tsuji ... conspicuous figures in U.S.-funded operations included [a] mob boss and war profiteer [and] former private secretary to Hideki Tojo, the wartime prime minister hanged as a war criminal in 1948. The assessments ... show evidence that other U.S. agencies, such as the Air Force, were also looking into using some of the same people as spies, and that the CIA itself had contacts with former Japanese war criminals. Historians long ago concluded that the Allies turned a blind eye to many Japanese war crimes, particularly those committed against other Asians. Some of Japan's most notorious wartime killers [came] under U.S. sponsorship. Tsuji, for instance, was wanted for involvement in the Bataan Death March of early 1942, in which thousands of Americans and Filipinos perished. The U.S. Air Force attempted unsuccessfully to recruit him after he was taken off the war crimes list in 1949. The Army considered him a potentially valuable source. [Yet] a CIA assessment from 1954 ... says: Tsuji is the type of man who, given the chance, would start World War III without any misgivings."