FAA inspectors have a form (more of a tag, really) that is designed to
be attached to an aircraft that the inspector believes should not be
flown. If one removes that tag, and flies the aircraft anyway, one may
lose the privilege of flying for some set period. Not immediately, but
in due course. I knew a pilot who did so. He flew the aircraft three
states away from the site it was tagged. The FAA inspector traced the
plane, found its location, notified the local FSDO, got the assistance
of the local sheriff, who chained and locked the aircraft to the ground.
All in one day. And merely because one of the elevators had a 12"
crack.

And then there was the FAA inspector who tagged an aircraft with a Q-tip
prop because he thought it had prop damage. True story, happened back in
the late-70's, early 80's.