Definition of "policeman"

The policeman who arrests the "Red" does not understand the theories the "Red" is preaching; if he did, his own position as bodyguard of the monied class might seem less pleasant to him.

1941, George Orwell, The Lion and the Unicorn, Pt. I

Meanwhile Nanny Broome was recovering from her initial panic and seemed anxious to make up for any kudos she might have lost, by exerting her personality to the utmost. She took the policeman's helmet and placed it on a chair, and unfolded his tunic to shake it and fold it up again for him.

1963, Margery Allingham, chapter 19, in The China Governess‎

A team may have a policeman or enforcer.

2002, P. J. Harari, Dave Ominsky, Ice Hockey Made Simple: A Spectator's Guide, page 26