Gestapo
noun
1
the police. Originally used of the military police during World War 2 in a (presumably) jocular allusion to the German Secret Police of the Third Reich. Often used with 'the' UK, 1941.
2
uniformed personnel (such as bus inspectors) or others (such as teachers) who enjoy the little power of their authority UK, 1969.
3
the motorcycle officers of the Metropolitan police traffic division. Police use (especially the Metropolitan Police Drugs Squad); probably inspired by the jackboots and black breeches uniform UK, 1999