truther

Etymology
From or. For sense 2, directly from name of the 9/11 Truth movement.

Noun

 * 1)  Someone who tells the truth.
 * 2)  Someone who believes that the US government was responsible for the 9/11 attacks.
 * 3) * 2006, George Washington, Social Proof, George Washington's Blog, 26 May:
 * Therefore, virtually every press release or statement about 9/11 should include a reference to the poll to show people that many Americans are 9/11 truthers who scoff at the 9/11 Commission as a fraud and that demand a real 9/11 investigation.
 * 1)  A conspiracy theorist who does not believe the accepted story about some significant event, fact, etc.
 * Therefore, virtually every press release or statement about 9/11 should include a reference to the poll to show people that many Americans are 9/11 truthers who scoff at the 9/11 Commission as a fraud and that demand a real 9/11 investigation.
 * 1)  A conspiracy theorist who does not believe the accepted story about some significant event, fact, etc.
 * 1)  A conspiracy theorist who does not believe the accepted story about some significant event, fact, etc.