I only know Rikers Island from the 1970s TV show “Barney Miller.”
Suspects held longer than a couple of hourse were sent to Rikers Island, and the nutcases were sent to Belleview Hospital.
I first heard of it in that Jim Carroll song:
Brian got busted on a narco rap
He beat the rap by rattin’ on some bikers
He said, hey, I know it’s dangerous
But it sure beats Riker’s
But the next day he got offed
By the very same bikers