We are union. We are the union. City services in Philadelphia grinding to a halt.With the city's largest municipal workers union on strike, its 9,000 members include everyone from 911 operators to sanitation workers. With trash collection stopped, concerns that garbage will start to pile up on city streets. But union members say it sends a clear message.If this is what we have to do to get our point across to let the mayor know that we're not playing, by all means, let the trash pile up. The strike beginnin ...