Zinn was an unapologetic, Marxist, anti-American POS -- the released FBI documents merely drive the truth home.
Zinn is dead. Unfortunately, he's just not dead enough,....yet. With a fatuous Zinn.org website updated regularly (including proud links to the FBI documents), and seemingly no shortage of Omega-columnists providing carefully selective references to the released files, (including avoiding any mention of the record showing he was filmed teaching Marxism to ACP members, nor of his associating with just about every ACP front group that came along) his legacy will no doubt 'struggle' on for some time, carried by the latest crop of equally despicable fellow travellers.
Update: Some observations on Zinn and his fan base from Ron Radosh.