A liberal activist and organizer coordinated with reporters from the conservative news site Breitbart during the primaries to cover his disruptions of events for candidates such as Sen. Marco Rubio. Aaron Black, an associate with Democracy Partners and a former Occupy Wall Street organizer, worked with the pro-Trump site Breitbart, tipping it off about his stunts, exchanging raw video and coordinating coverage, according to a source with direct knowledge of the situation. Black has resurfaced recently as one of the people featured in undercover video from the Project Veritas group. In the video, he claims to work for the Democratic...