One thing we can look at is FDR's association with Alger Hiss. Remember, it was not Senator Nixon that fingered Hiss as a Communist spy, it was wave after wave of Soviet spies defecting to the United States that pointed the finger at Hiss. During Perestroika the Russian goverment made the statement that if anyone can't find evidence that Hiss was a Soviet spy, than that person just isn't looking.