Squad
He had a group of "secret police" called the Gestapo.
it's called "a mess." Yes that may seem humorous, but it's also true.
Central Motorway Police Group was created in 1990.
North West Motorway Police Group was created in 2008.
A group of policemen is commonly referred to as a "police force" or "police department." In some contexts, they may also be called a "squad" or "unit," especially when referring to a specific team within the larger organization, such as a SWAT team or traffic unit. The terminology can vary based on the country and local law enforcement structure.
Victoria Police Special Operations Group's motto is 'Blessed are the peacemakers'.
The police don't protect the group itself, the police protect the rights of said group under the constitution of the United States and the state which they are in. What the police protect are the rights of the group to assemble, protest or speak regardless of the disgust one may feel toward that group. However, as a group has the right to speak, I also have the right to ignore that speech.
squad
Special Escort Group - Ministry of Defence Police - was created in 1991.
Police Call - 1954 The Harris Group was released on: USA: 1955
A group of constables tasked with enforcing the law is typically referred to as a "constabulary." This term is often used to describe a body of officers or a police force in certain regions, particularly in the UK and some Commonwealth countries. In other contexts, they may simply be referred to as a "police unit" or "law enforcement agency."
You could refer to them as a group of police, or officers, fuzz, or cops, coppers. There are derogatory terms you could use, but we won't include them here.