Once an international workers' holiday, May Day 2012 is expected to be a global day of protest. Rallies have already taken place across Asia, and Europeans are expected to take to the streets to protest government-imposed austerity measures. In the United States, demonstrations, strikes and acts of civil disobedience are planned, including what could be the country's most visible Occupy rallies since the anti-Wall Street encampments came down in late 2011. - AP