Occupy groups join for May Day protests – in pictures

A rainy start to the day in Bryant Park in New York Photograph: James Fassinger

Black-clad Occupy protesters in Union Park in Chicago Photograph: Tannen Maury/EPA

'USA – land of the thief, home of the slave', this banner reads Photograph: James Fassinger

California highway patrol officers near the Golden Gate bridge wait for possible May Day demonstrations in San Francisco Photograph: Robert Galbraith/Reuters

Mario Lozada (left) and Eileen Maxwell from Occupy Congress march in New York Photograph: James Fassinger

New York protesters defy the rain to march uptown Photograph: James Fassinger

Placards wait to be picked up in Union Park in Chicago Photograph: Tannen Maury/EPA

New York protesters continue their demonstrations as the weather brightens Photograph: Andrew Katz

Protesters in San Francisco paint a mural at the intersection of Market and Montgomery Streets Photograph: Justin Sullivan/Getty Images

Police look on as activists demonstrate in New York Photograph: Andrew Katz

World Trade Center first responder Walter Hillegass marches with protesters in New York Photograph: James Fassinger

Protesters, with placards reading: "Legalisation yes, deportation no" march for immigration rights in Los Angeles Photograph: Jason Redmond/Reuters

Oakland police officers fire tear gas to control a group of protesters near City Hall Photograph: Kimihiro Hoshino/AFP/Getty Images

A large cut-out representing corporate power in San Francisco Photograph: Robert Galbraith/Reuters

Tens of thousands of protesters marched down Broadway to Wall Street during the May Day march. Photograph: James Fassinger

Clergy from Occupy Faith, a multi-denominational group, march down Broadway Photograph: James Fassinger