By By Kyle Swenson The Washington Post Their faces hidden behind black bandannas and hoodies, about a 100 anarchists and antifa - "anti-fascist" - barreled into a protest Sunday afternoon in Berkeley's Martin Luther King Jr. Civic Center Park. Jumping over plastic and concrete barriers, the group melted into a larger crowd of around 2,000 that had marched peacefully throughout the sunny afternoon for a "Rally Against Hate" gathering. Shortly after, violence began to flare.