People gather at the Bastille Square in Paris as part of the annual May Day workers' events on May 1, 2012 in Paris, France. Photo by Alain Apydin/ABACAPRESS.COM # 318656_001

People gather at the Bastille Square in Paris as part of the annual May Day workers' events on May 1, 2012 in Paris, France. Photo by Alain Apydin/ABACAPRESS.COM # 318656_002

People gather at the Bastille Square in Paris as part of the annual May Day workers' events on May 1, 2012 in Paris, France. Photo by Alain Apydin/ABACAPRESS.COM # 318656_004

People gather at the Bastille Square in Paris as part of the annual May Day workers' events on May 1, 2012 in Paris, France. Photo by Alain Apydin/ABACAPRESS.COM # 318656_009

People gather at the Bastille Square in Paris as part of the annual May Day workers' events on May 1, 2012 in Paris, France. Photo by Alain Apydin/ABACAPRESS.COM # 318656_012

People gather at the Bastille Square in Paris as part of the annual May Day workers' events on May 1, 2012 in Paris, France. Photo by Alain Apydin/ABACAPRESS.COM # 318656_013

People gather at the Bastille Square in Paris as part of the annual May Day workers' events on May 1, 2012 in Paris, France. Photo by Alain Apydin/ABACAPRESS.COM # 318656_016

People gather at the Bastille Square in Paris as part of the annual May Day workers' events on May 1, 2012 in Paris, France. Photo by Alain Apydin/ABACAPRESS.COM # 318656_017

People gather at the Bastille Square in Paris as part of the annual May Day workers' events on May 1, 2012 in Paris, France. Photo by Alain Apydin/ABACAPRESS.COM # 318656_018

People gather at the Bastille Square in Paris as part of the annual May Day workers' events on May 1, 2012 in Paris, France. Photo by Alain Apydin/ABACAPRESS.COM # 318656_022

Police arrest a protester during May Day demonstrations in downtown Oakland, California, USA, on Tuesday, May 1, 2012. Photo by D. Ross Cameron/Oakland Tribune/MCT/ABACAPRESS.COM # 318632_001

Police clash with protesters during May Day demonstrations in downtown Oakland, California, USA, on Tuesday, May 1, 2012. Photo by D. Ross Cameron/Oakland Tribune/MCT/ABACAPRESS.COM # 318632_002

Police clash with protesters during May Day demonstrations in downtown Oakland, California, USA, on Tuesday, May 1, 2012. Photo by D. Ross Cameron/Oakland Tribune/MCT/ABACAPRESS.COM # 318632_003

Protesters during May Day demonstrations in downtown Oakland, California, USA, on Tuesday, May 1, 2012. Photo by D. Ross Cameron/Oakland Tribune/MCT/ABACAPRESS.COM # 318632_004

A police officer stands in a cloud of tear gas during May Day demonstrations in downtown Oakland, California, USA, on Tuesday, May 1, 2012. Photo by D. Ross Cameron/Oakland Tribune/MCT/ABACAPRESS.COM # 318632_005

Protesters vandalize a Bank of America during May Day demonstrations in downtown Oakland, California, USA, on Tuesday, May 1, 2012. Photo by D. Ross Cameron/Oakland Tribune/MCT/ABACAPRESS.COM # 318632_006

A police officer jumps to take down a sign that was part of a barricade as protesters refuse to obey police orders to disperse from a May Day rally at Frank Ogawa Plaza in downtown Oakland, California, USA, on Tuesday, May 1, 2012. Photo by Anda Chu/Oakland Tribune/MCT/ABACAPRESS.COM # 318658_001

Police go after protesters who refused to obey orders to disperse a May Day rally at Frank Ogawa Plaza in downtown Oakland, California, USA, on Tuesday, May 1, 2012. Photo by Anda Chu/Oakland Tribune/MCT/ABACAPRESS.COM # 318658_002

A protester is taken into custody for not obeying police orders to disperse a May Day rally at Frank Ogawa Plaza in downtown Oakland, California, USA, on Tuesday, May 1, 2012. Photo by Anda Chu/Oakland Tribune/MCT/ABACAPRESS.COM # 318658_003

Police close in on protesters who did not obey orders to disperse from a May Day rally at Frank Ogawa Plaza in downtown Oakland, California, USA, on Tuesday, May 1, 2012. Photo by Jane Tyska/Oakland Tribune/MCT/ABACAPRESS.COM # 318658_004