It was revealed in 2011 by WTAE-TV in Pittsburgh that the FBI had kept extensive files on Sheriff Coon beginning in the early to mid-1970s and suspected him of "protecting" and "enforcing" for the Pittsburgh Mob, most notably Tony Grosso's organization. [2] No charges nor public investigation were ever pursued, however the files connect Coon with the same organization that Federal investigators suspected in the death of District Attorney for Pittsburgh Robert Duggan in early 1974. Then U.S. District Attorney, and later Governor of Pennsylvania and U.S. District Attorney, Richard Thornburgh chose to close the cases and the investigation by 1975.
http://earlyreturns.post-gazette.com/index.php/early-returns-20/53-post-gazette-staff/2827-ch4-gets-coonduggan-fbi-files
http://www.wtae.com/Team-4-Late-Pittsburgh-Politicians-FBI-Files-Revealed/-/9681798/7711370/-/hxa0ym/-/index.html?fb_action_ids=511608085619150&fb_action_types=og.recommends&fb_source=aggregation&fb_aggregation_id=288381481237582
