Morros was born in Saint Petersburg, Russia and immigrated with his family to America. He was recruited as a Soviet spy in 1934 and became a counterspy for the FBI in 1947. He then reported on Jack Soble and members of the Soble spy ring, while also passing low-level secrets and misinformation back to Moscow. Morros codename in Soviet intelligence and the Venona files is "FROST."
He was the producer of the Laurel and Hardy film The Flying Deuces among others.
- Boris Morros, My Ten Years as a Counter-Spy (London: Werner Laurie, 1959).