The police are persons empowered to enforce the law, protect property and reduce civil disorder. Their powers include the legitimised use of force. The term is most commonly associated with police services of a state that are authorised to exercise the police power of that state within a defined legal or territorial area of responsibility. Police forces are often defined as organisations separate from any military forces, or other organisations involved in the defense of the state against foreign aggressors; however, gendarmerie and military police are military units charged with policing.
Three months before the birth of Harry Potter, two policemen named PC Anderson and Sergeant Fisher chased two young boys on a motorbike. They caught the boys in a dead-end alley and asked for their names. The two boys first gave three random names: Wilberforce, Bathsheba and Elvendork. But soon after, they identified themselves as James Potter and Sirius Black. The two policemen saw three men flying on broomsticks, and were shocked to see the young boys using some sticks to lift up their police car to fend off the men.
In the summer of 1943, the Muggle Frank Bryce was taken to a police station for questioning following the deaths of Thomas Riddle, Mary Riddle and Tom Riddle Sr. Though he was released without charge, the experience left him deeply mistrustful of police from that point forward. Despite this mistrust, he resolved to call the police upon hearing Lord Voldemort and Peter Pettigrew plotting the capture and murder of Harry Potter. Before he could, however, his presence was discovered by Nagini and reported to Voldemort.
On either 31 August or 1 September, 1994, Alastor Moody's Muggle neighbours called policemen to report a disturbance when his dustbins were set off by Bartemius Crouch Jr. This incident was later reported by Rita Skeeter in an article in the Daily Prophet.