went on strike
... that African porters in Salvador, Bahia, went on strike after the provincial government passed a law requiring them to wear metal identification tags?
... that African <a href="./Porter_(carrier)" id="mwBVw" rel="mw:WikiLink" title="Porter (carrier)">porters</a> in <a href="./Salvador,_Bahia" id="mwBV0" rel="mw:WikiLink" title="Salvador, Bahia">Salvador, Bahia</a>, <b id="mwBV4"><a href="./Revolution_of_the_Ganhadores" id="mwBV8" rel="mw:WikiLink" title="Revolution of the Ganhadores">went on strike</a></b> after the provincial government passed a law requiring them to wear metal identification tags?