Sing Sing was the name of a jail in upstate New York.
In The Big Good-Bye, Detective Jim Tierney had sent the master criminal Silent Forrester to this prison once, and intended to send him back there again. (TNG: "The Big Goodbye")
The pages seen in the episode were from the detective novel, The Listening Man, by author John A. Moroso. This novel was published in 1924. Information on Sing Sing was from page 107.