Those are obviously members of the Guardian Angels, the group started by radio host Curtis Sliwa in 1979 to address a growing crime problem in the city, primarily on the subways. They appear to be marching outside a Queens police precinct.
We couldn't find out much information on Borelli via a really basic Google search. We were able to discover that during the 80s he served as commanding officer of Queens Detectives.
That piece of information came through an interesting New York Times article we found online from March 15, 1986. Borelli was quoted in a piece about a city worker who hanged himself in a back room of Borough Hall.
The interesting fact about the incident was that it occurred the day after former Queens borough president Donald Manes killed himself.
There was some speculation that the two suicides might somehow be linked, but Borelli shot down the notion.
Other than that, we don't have much information on Borelli, but judging from this scene in the photo, he appears to have become embroiled in some sort of controversy that would prompt people to march in support outside a precinct.
If you have any information you can share on Deputy Chief Joseph Borelli, get in touch with us at firstname.lastname@example.org