Hillary Clinton campaign chairman John Podesta has responded to the WikiLeaks publication of his private emails by suggesting they were stolen by the Russians to elect Donald Trump. What he doesn’t like to talk about is the business he’s done with a Kremlin-backed investment firm and the lengths he’s gone to avoid scrutiny of this relationship.

“Clinton Cash” author Peter Schweizer and the Trump campaign have been urging the media to pay attention to Mr. Podesta’s Russian connection and perhaps they should. The story begins...