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.
Maybe just a squad?
Ideal Policemen - 1908 was released on: USA: 31 October 1908
a group of Blackbirds is called a murder
RETIRED GEN. FRANCO CALIDA. AS FORMER CHIEF OF POLICE OF DAVAO CITY, PHILIPPINES, HE ORGANIZED AND LED A VIGILANTE GROUP CALLED "ALSA MASA" (LITERALLY, "RISE UP, MASSES") TO FIGHT THE COMMUNISTS WHO WERE TERRORIZING DAVAO CITY RESIDENTS, ESPECIALLY THE POLICEMEN.
A group of mules is called a barren, span or pack.
A group of bluebirds is called a flock, hermitage, or mutation.
In the year 2030 it is likely policemen will be called robocops. With the way that technology is going, it really seems possible.
The collective nouns for policemen are a squad of policemen and a posse of policemen.
The novel is called The Yiddish Policemen's Union.
There were no "policemen" in the First Fleet. The men guarding the prisoners were called marines.
The possessive form of the plural noun policemen is policemen's.example: Several of the policemen's cars were used to protect the accident scene.
Yes, the word 'policemen' is a noun, the plural form of the noun policeman. The noun 'policemen' is a word for people.
85 policemen died