KGO: Bay Area May Day protests

<div class="meta image-caption"><div class="origin-logo origin-image none"><span>none</span></div><span class="caption-text">Oakland police officers and protesters clash during a May Day march in downtown Oakland &#40;May 1, 2012&#47;KGO&#41;</span></div>
May 1, 2012 10:51:21 PM PDT