George Orwell introduced a similar concept in his 1949 novel Nineteen Eighty-Four using the term thoughtcrime to describe illegal thoughts which held banned opinions about the ruling government or intentions to act against it. A large part of how it differs from precrime is in its absolute prohibition of anti-authority ideas and emotions, regardless of the consideration of any physical revolutionary acts. However, Orwell was describing behaviour he saw in governments of his day as well as extrapolating on that behaviour, and so his ideas were themselves rooted in real political history and current events.