As masked leftists use clubs to shut down free speech at Berkeley and elsewhere, Democrats have unfortunately been reticent to condemn the activity. But Antifa violence is not the only kind of condemnable disruptive activity. Democrats should also disavow the organized campaign to harass Republican congressmen and stop Republican town halls. One group in the thick of this battle is “Indivisible.” The group was founded by a former staffer for Democratic Rep. Lloyd Doggett, and its COO, Matt Traidi, is the research coordinator for the Service Employees International Union. Indivisible provides these instructions on how to prevent other town hall...