I found the following to be very educational as I did not know Felt's political persuasion until now:
Felt himself turns out to have been both a hero of an earlier war on terrorism and a victim of the criminalization of policy differences. During the Carter administration, as O'Connor notes, Felt, who by then had left the FBI, "was indicted on charges of having authorized illegal F.B.I. break-ins earlier in the decade, in which agents without warrants entered the residences of associates and family members of suspected bombers believed to be involved with the Weather Underground." He was convicted in 1980. "Then, in a stroke of good fortune while his case was on appeal, Ronald Reagan was elected president." On April 15, 1981, Reagan granted Felt a full pardon.
Little wonder, then, that Felt, who had been a registered Democrat, "turned Republican during the Reagan years," as O'Connor notes. In this respect he was far from alone--and by helping to force the resignation of a Republican president, he might have helped set the stage for a Republican ascendancy.
The left's greatest hero was being railroaded by them! No wonder Carter could not win an election for dog catcher!