"The latest criticism of the ACLU has come from some of the same people who had heaped praise and donations on the organization for its resistance to President Donald Trump’s travel ban. Membership surged from 425,000 to 1.6 million, with $90 million in online contributions, in the months since Trump’s election."

That's really the rub isn't it. There seems to be a greater and greater percentage of people in this country who "support free speech" but really only when it's speech that is aligned with their political and personal beliefs. It's especially shocking that board members of an ACLU chapter would resign. It suggests a fundamental ignorance or utter disregard for the founding principles of the organization. There likely isn't anyone at the ACLU who supports neo-Nazis and the KKK, but they understand that it's allowing difficult free speech that's really the underpinning of the entire First Amendment.