The D.C. police, armored and with visors down, marched in formation toward the barricade separating them from 500 protesters clustered at the intersection of 20th Street and Pennsylvania Avenue on Monday morning. As they marched, the officers slapped their batons against their shinguards in rhythm.

“It’s intimidation,” said David Grewal, a Yale first-year law student. Grewal, a volunteer for the National Lawyers Guild, was standing with the protesters at the barricade within sight of the World Bank, shouting advice and keeping a wary eye on the advancing officers.