Don't know in every case their political leanings, but here are some of my favs:
"We must guard against the impostures of pretended patriotism, especially that patriotism which is the last refuge of scoundrels and which is so prevalent, so professional and so well paid nowadays. Eternal vigilance must become more than the slogan for small associations desperately fighting almost overwhelming cases of infringements on individual liberties.
"We must realize that those who use red-baiting to attack every liberal and democratic movement today, are the armed cutthroats of reactionary Fascism tomorrow.
"Two facts emerge from any study of European turmoil and the new class alignment in our own land. The enemy is always the Right. Fascism and Reaction inevitably attack. They have won against disunion. They will fail if we unite." ~George Seldes, "You Can't Do That" 1938
"It is going to take a lot more than a Chicken Hawk holding a turkey to fix the morale problems in Iraq."-- Mick Youther
"The saving of our world from pending doom will come, not through the complacent adjustment of the conforming majority, but through the creative maladjustment of a nonconforming minority." ~Martin Luther King, Jr., 1963
"Anyone who has the power to make you believe absurdities has the power to make you commit injustices." - Voltaire, 1767.
"It is hard to fight an enemy who has outposts in your head." – Sally Kempton
"The more we do to you, the less you seem to believe we are doing it." -- Dr. Joseph Mengele
"When all think alike, no one is thinking very much." -- Walter Lippmann
"History is the version of past events that people have decided to agree upon." – Napoleon Bonaparte
"It is well enough that people of the nation do not understand our banking and monetary system, for if they did, I believe there would be a revolution before tomorrow morning." -- Henry Ford
"Until they become conscious they will never rebel, and until after they have rebelled they cannot become conscious" -- George Orwell, 1984
"You take the blue pill the story ends - you wake up in your bed and believe, whatever you want to believe. You take the red pill - you stay in Wonderland, and I show you just how deep the rabbit hole goes." – Morpheus, in The Matrix