In a new miniseries from “On the Media,” “We Don’t Talk About Leonard,” the ProPublica reporters Andrea Bernstein, Andy Kroll, and Ilya Marritz investigate the background of the man who has played a critical role in the conservative takeover of America’s courts via the Federalist Society: Leonard Leo. It traces Leo’s path from humble roots in middle-class New Jersey (he was nicknamed Moneybags Kid) to a mansion in Maine where, last year, he hosted a fabulous party on the eve of the Supreme Court decision to tank Roe.