FILE - Members of the Vietnam Veterans Against the War raise clenched fists after ending their 40-hour occupation of State of Liberty, which can be seen behind them, Dec. 28, 1971. They’re hallmarks of American history: protests, rallies, sit-ins, marches, disruptions. They date from the early days of what would become the United States to the sights and sounds currently echoing across the landscapes of the nation’s colleges and universities. (AP Photo/Anthony Camerano, File)