When fascism comes to America, it will be wrapped in the flag and carrying a cross. – widely attributed to Sinclair Lewis, but actually an amalgam of quotes from others including Huey Long, apparently first put together in a 1938 article in the New York Times
"The enemy isn't liberalism. The enemy isn't conservatism. The enemy is bullshit." – Lars-Erik Nelson
"The only thing necessary for the triumph of evil is for good men to do nothing." – misattributed to Edmund Burke, but widely agreed with
"Voice or no voice, the people can always be brought to the bidding of the leaders. That is easy. All you have to do is tell them they are being attacked, and denounce the pacifists for lack of patriotism, and exposing the country to danger." Hermann Göring, from The Nuremburg Diaries
"I hope we shall take warning from the example [of England] and crush in its birth the aristocracy of our monied corporations which dare already to challenge our government to a trial of strength and bid defiance to the laws of our country."