The Democracy Alliance takes pains to ensure that its work disbursing millions of dollars to top left-wing organizations remains secretive and free from public scrutiny. But a document left on the floor of the group’s recent gathering reveals for the first time the names of a number of individuals involved in the effort. It lists new Democracy Alliance “partners,” individuals who every year must pay $30,000 in dues and contribute at least $200,000 to the groups that DA supports. It also reveals names of DA “advisers,” foundation participants, and individuals getting a “sneak peek” at the group’s activities. Among its...