Dolitical prisonersSAIGON (UPI) — Theaigon government denies lolding any political pris-iners, but well - informed outh Vietnamese sources ay several thousand of the etainees are languishingo jails.Many political prisonersire non-Communist pawns o a cold-blooded negotiat-ng game between the gov-rnment of PresidentJguyen Van Thieu and the liet Cong.The political prisoner ssue has led to many :harges. but few facts have :ome to light. There have »een charges of as many asto an unspecified numbpro - Communists stijail.One source closelj volved with political tainees agreed to pro secret information to ited Press Internationicondition he remaii identified.Total about 37,00«The source said Si Vietnam's total civil pi population of about 3’ on March 1 included a 8,500 persons who coul classed as political tainees under a broad lt;sification of “disturbe the peace.”