Five or six decades ago, a big crowd meant something big. When 250,000 people gathered for the 1963 March on Washington, or nearly a million showed up for the 1982 anti-nukes rally in Central Park, it symbolized a certain power and legitimacy, a collective coming-of-age. A major protest presented a huge organizational challenge, and pulling one off delivered a potent message: Here was a force to be reckoned with. ¶ Today, the mass protest is often seen as a beginning, not an end — a moment of “b