The FBI kept a close eye on late “60 Minutes” correspondent Mike Wallace during a 1970 trip to Cuba, recently released files show, CBS News reports .
The documents detail the luggage and travel information of Wallace and “60 Minutes” creator Don Hewitt, according to CBS News.
The FBI also investigated a threatening letter sent to Wallace in 1977 by a World War II veteran. The letter “claims to have solid proof that” Wallace is “a pro-communist anti-American traitor.
Charges were never filed because the FBI said there was no criminal intent, the CBS News wrote.