Thomas Jefferson once famously wrote, "All tyranny needs to gain a foothold is for people of good conscience to remain silent."

Or did he? Numerous social movements attribute the quote to him. "The Complete Idiot's Guide to U.S. Government and Politics" cites it in a discussion of American democracy. Actor Chuck Norris's 2010 treatise "Black Belt Patriotism: How to Reawaken America" uses it to urge conservatives to become more involved in politics. It is even on T-shirts and decals.

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