Answer: Officer Krupke
William Bramley portrayed Officer Krupke both on Broadway and in the movie. This officer was somewhat slow witted.
The Jets sang this song to Officer Krupke as they tried to explain why they were the way they were. The Officer was seen a number of times in the movie, most notably at Doc's store. There were a number of famous lyrics from this song such as:
Dear kindly Sergeant Krupke,
You gotta understand,
It's just our bringin' up-ke
That gets us out of hand.
Our mothers all are junkies,
Our fathers all are drunks.
Golly Moses, natcherly we're punks!
And
Gee, Officer Krupke,
We're down on our knees,
'Cause no one wants a fellow with a social disease.
Gee, Officer Krupke,
What are we to do?
Gee, Officer Krupke,
Krup you!
This song was changed for the movie to get by the censors.