Paranoia Press was one of the early Approved for Traveller publishers and was founded by Chuck Kallenbach II and Donald Rapp. Paranoia Press published a number of supplements for Classic Traveller. They were superceded by later materials from GDW and DGP.
Meta-history and background
Paranoia Press products have been declared non-canon by Marc Miller.
Fans are still, of course, welcome to enjoy them.