Luigi Mangione now at prison known as "Hell on Earth"

Image: Luigi Mangione mugshot / PA Department of Corrections

Luigi Mangione, arrested earlier this month for killing Healthcare CEO Brian Thompson, is now in federal custody at Brooklyn's "nightmarish" Metropolitan Detention Center, where Sean "Diddy" Combs currently resides.

Also known as "Hell on Earth," the prison is a magnet for "famous felons," repor…