Thought Police 

From George Orwell's 1984. A Gestapo organization responsible for monitoring all citizens and making sure they are not guilty of political dissent, or thoughtcrime.

The FBI is on its way to becoming the Thought Police.

Thought Police by Mack June 23, 2004

UD Thought Police 

A group of Politically Correct conservatives that patrol Urban Dictionary
Voting down any definition that doesn't support their Status Quo.

they also create slanderous definitions about those who disagree with them.

Bill: Who keeps attacking my definitions

Ted: must be the UD Thought Police

UD Thought Police by Anon aginst PC Conservatves February 17, 2009