X-2 Counter Espionage Branch

The head of the Office of Strategic Services (OSS), William Donovan, created the X-2 Counter Espionage Branch in 1943 to provide liaison with and assist the British in its exploitation of the Ultra program's intelligence during World War II. A few months before, Donovan had established a Counterintelligence Division within the Secret Intelligence Branch of the OSS but rescinded this order upon development of the X-2. The X-2 was led by James Murphy, whose branch would have the power to veto operations of the Special Operations and Secret Intelligence Branches without explanation. Donovan modeled the Counter Espionage Branch on British Counter Espionage. With the creation of the X-2 Branch, the British insisted that it follow British security procedures to maintain the secrecy of Ultra. The X-2 established separate lines of communication for itself as a self-contained unit. By the end of World War II, the X-2 had discovered around 3,000 Axis agents.