Traditional liberals who have made their home in the Democratic Party should be wary of these groups. Much like the Sanders campaign, many of them are dominated by Occupy Wall Street veterans, whose brand of unfocused revolutionary politics was widely derided by Democrats and Republicans alike in 2011. They are at war with certain core liberal values, particularly as regards free speech.

Several weeks ago, for example, dozens of Black Lives Matter activists infiltrated a Donald Trump rally and forced the organizers to cancel due to security concerns, after they became involved in heated confrontations with Trump’s supporters. Whatever one may think of Trump’s policies, there is no excuse for preventing the candidate from expressing them at a political rally. They abridged both Trump’s right to free expression and the ability of thousands of their fellow citizens to participate in the political process.

MoveOn thanked the disruptors for their actions…

We know that these repressives support Bernie. We need to know whether he supports them.