<p>ST. LOUIS — A small but loud group of protesters on Thursday crashed the party celebrating the 10th anniversary of the MetroLink light rail system, voicing unhappiness over the lack of minority-owned firms involved in expanding the system. Activist and Democratic presidential candidate Al Sharpton was among 20 or so protesters who walked through the event outside Union Station, where a few hundred people gathered for cake and to hear speeches from civic leaders. Meanwhile, protesters chanted and carried signs reading, "Economic Racism" and "No Justice, No Peace."</p>