A recently released (but heavily redacted) FBI file shows that the agency began investigating the personal life of sex siren Marilyn Monroe in 1955. The Bureau was then under the command of J. Edgar Hoover, who was a rabid anti-Red. Hoover also ensured his longevity at the Bureau -despite being despised by a succession of Presidents-  because he deftly used FBI resources to gather potentially scandalous information, often of a political or sexual nature, that could be brandished as "incentives" to keep him on the job. During the anti-Communist paranoia of the 1950s, Hoover had Monroe investigated because of her marriage to playwright Arthur Miller, who was deemed a communist sympathizer. The FBI feared that the popular Monroe could be enlisted as a propaganda tool for the Reds. For more click here