I had promised Bernie when I took the helm of the Democratic National Committee after the convention that I would get to the bottom of whether Hillary Clinton’s team had rigged the nomination process, as a cache of emails stolen by Russian hackers and posted online had suggested. I’d had my suspicions from the moment I walked in the door of the DNC a month or so earlier, based on the leaked emails. But who knew if some of them might have been forged? I needed to have solid proof, and so did Bernie.
So I followed the money. My predecessor, Florida Rep. Debbie Wasserman Schultz, had not been the most active chair in fundraising at a time when President Barack Obama’s neglect had left the party in significant debt. As Hillary’s campaign gained momentum, she resolved the party’s debt and put it on a starvation diet. It had become dependent on her campaign for survival, for which she expected to wield control of its operations.
https://www.politico.com/magazine/story/2017/11/02/clinton-brazile-hacks-2016-215774
So, it's not so much that the DNC skewed the primary elections to help the Clinton Campaign, it's that the DNC was the Clinton Campaign.
Also it seems Donna Brazile is a Russian hacker.
https://www.politico.com/magazine/story/2017/11/02/clinton-brazile-hacks-2016-215774