Occupy Wall Street participants march down Fifth Avenue in New York on May 1, 2012. Lingering anger over the 2008 global financial crisis has fueled several populist movements, including most recently, the battle waged by amateur investors coordinating in Reddit against hedge funds.

Occupy Wall Street participants march down Fifth Avenue as part of May Day events in New York, May 01, 2012. The Occupy movement that shook the United States last year, spawning similar protests worldwide, announced widespread May Day demonstrations and strikes against social inequality Tuesday. The protests, billed as stretching from New York to California, and from Spain to Australia, raised the possibility of disruption in dozens of urban centers on the date when many countries observe International Workers’ Day. AFP PHOTO/Emmanuel Dunand (Photo credit should read EMMANUEL DUNAND/AFP/GettyImages)