Free Speech
The LATimes notes the fines imposed for free speech from the power hungry FEC. 527's were fined because they theoretically should have been registered as PAC's. Evidence? Well none.
What did the groups really do wrong? Did they bribe or corrupt politicians? Well, no. You won't find "Duke" Cunningham, William Jefferson or Bob Ney connected to MoveOn or the Swift Boat Veterans. Did they make illegal contributions to campaigns? Well, no again. Did they seek out special favors or illegally coordinate their efforts with candidates? No. The FEC admitted that, after a "thorough" investigation, it found no evidence that any of the groups operated in concert with candidates or sought legislative favors.