Dmitri Fyodorovich Polyakov was a major general in the Soviet GRU during the Cold War. According to former high-level KGB officer Sergey Kondrashev, Polyakov acted as a KGB disinformation agent at the FBI's New York City field office when he was posted at United Nations headquarters in 1962. Kondrashev's post-Cold War friend and former high-level CIA counterintelligence officer Tennent H. Bagley says Polyakov "flipped" and started spying for the CIA when he was reposted to Rangoon, Moscow, and New Delhi. Polyakov was suddenly recalled to Moscow in 1980, arrested in 1986, tried, and finally executed in 1988.
In the CIA, Polyakov was known by code names "Bourbon" and "Roam", while the FBI referred to him as "Tophat".