FBI
Federal Bureau of
Investigation.
Marilyn in 1955 became an intense observation subject when she started to date Arthur Miller. After this time, her movings and activities were carefully noticed, from the people she met in New York until her interest for everything which was from Russia.
The FBI, the CIA and the General AttorneyDonald Spoto said that J.Edgar Hoover himself commanded a close surveillance of Marilyn abroad, with or without Miller, for private or professional reasons.