The custodian of Joe Biden’s vice presidential records, a key witness in his classified documents probe, was caught up in another documents scandal while working at the Commerce Department during the Clinton administration, court records reveal.  Longtime Biden aide and gatekeeper Kathy S. Chung, who has been interviewed by federal prosecutors and congressional investigators in the Biden case, was part of a team sanctioned for withholding and even destroying key documents in the federal case that sought sensitive records from a central figure in the so-called Chinagate fundraising investigation of the late 1990s, RealClearInvestigations has learned exclusively.