Demonstrators caused major delays and frustrated drivers keen to get to work during rush hour.
The president plans to send federal agents to Chicago and Albuquerque despite claims they have "terrorised" peaceful protesters in Portland.
ACT UP vets like Ken Kidd and younger organisers like Adam Eli are mixing proven tactics with social media to protest the Trump administration.
"We will make the country ungovernable," say coalition of left-wing campaigners.
"Holiday makers are being given advance notice to change travel plans," the group said in a statement.
Shadow trade secretary warns another vote would be bad for democracy.