Green’s Dictionary of Slang

(US) prison.

1971		E.E. Landy Underground Dict. (1972).
1990		S. Morgan Homeboy 57: I heard you were in la pinta, Joe.
1992		Bentley & Corbett Prison Sl. 53: Pinta Prison.
2019		D. Winslow Border [ebook] One thousand, four hundred and sixty days behind the walls of ‘La Pinta’ was plenty, because prison is the worst place in the world.