The FBI has released its files on the late "60 Minutes" correspondent Mike Wallace, detailing their scrutiny of a 1970 trip Wallace took to Cuba. There is also an investigation of a threatening letter sent to Wallace in 1977 by a World War II veteran titled "Communist Control of the Press."

The files were dug up from the bureau's records vault and were requested via the Freedom of Information Act. Read the documents here.

Wallace died on April 7, 2012, at the age of 93 and was widely recognized for his aggressive style in television interviews.

In the summer of 1970, Wallace and the late "60 Minutes" creator Don Hewitttraveled to Cuba. The FBI documents detail the luggage and travel information of the two men, but do not provide much other information. At first mention, the documents misspell Hewitt's name.

The documents also include a rambling letter sent to Wallace in 1977, in which the sender claims to "have solid proof that you are a pro-communist anti-America traitor."

An FBI investigation into the letter identified the sender as....REST OF IT