As the U.S. economy sank ever deeper into recession, and as millions of Americans faced job loss, plummeting home values, and deferred retirement dreams, angry protesters rallied across the nation. Activists on the conservative side were first to arrive on the scene. Throughout the winter and spring, the Tea Party managed to shift blame for the recession to the Obama administration and demanded that it reduce spending. The burgeoning Occupy Wall Street movement could be the spark that progressive activists have been waiting for -- an opportunity to reframe the economic crisis and generate broader support for government economic stimulation and for measures to promote greater equality. Occupy Wall Street's success will depend, in large part, on whether protesters effectively manage violence (as the Tea Party has) or fail to do so (as in the 1999 protests against the World Trade Organization in Seattle).
Protest movements must always walk a fine line between nonviolent and violent action. The power of protest comes from its capacity to disrupt business as usual. Without such disruption, it fails to give opponents any incentive to grant concessions or to give the media any reason to pay attention. Yet violence can generate a significant backlash among the general public, which in turn provides authorities with the cover they need to crack down.
Negotiating between impotence and overaggression is difficult. It is often police action that triggers violence at large protest events; research has shown that police crackdowns can quickly transform nonviolent events into violent ones. This was certainly the case in many campus demonstrations of the 1960s and 1970s. Excessive force used by police can work to the protesters' advantage, winning them public attention. For their part, the Occupy Wall Street protesters already seem to have benefited from media coverage of the police using pepper spray to disperse them and of a chaotic mass arrest on the Brooklyn Bridge.
Still, relying on police overreaction to spark public interest is not an effective strategy for building momentum.