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 Attorney
Office, in this year of 1955,
kept a watchful eye on each and every trips of those who, because of
the sympathies they had in the past with Communism, were considered as
dangerous enemies of the nation, sympathies which seemed to "prove"
their predilection for the Russian culture.