The annual Chicago May Day protests and marches, an annual tradition going back to 1886 with its connections to workers' struggles and immigrant rights, returned resoundingly in 2010. Participants this year highlighted, galvanized by a number of factors including frustration over inaction by the Obama Administration (despite campaign promises of solidarity) and fury over the controversial SB 1070 law in Arizona mandating racial profiling in that state.

Video coverage: May Day March Video | The Sights and Sounds of May Day 2010