Hollywood actor-director Rob Reiner teamed with Atlantic senior editor David Frum, Obama-era government officials, and vocal Donald Trump critics to launch an initiative Tuesday intended to help uncover the extent of Russia’s interference in the 2016 presidential election. “To understand the gravity of Russia’s invasion of our democracy, today we launch Committee to Investigate Russia,” Reiner wrote on Twitter Tuesday morning, linking to the organization’s website: InvestigateRussia.org. The Committee claims to be a “nonprofit, non-partisan resource provided to help Americans recognize and understand the gravity of Russia’s continuing attacks on our democracy,” according to its website. It will be a place where “all relevant information is aggregated...