Nearly 10,000 city workers in Philadelphia who collect trash, answer 911 calls, maintain city pools and perform other jobs went on strike Tuesday after contract negotiations broke down. District Council 33 of the American Federation of State,

Philadelphia's largest municipal union could go on strike starting Tuesday. Why it matters: The work stoppage would halt or delay critical city services — think trash pickups and 911 operator response times — ahead of the long Fourth of July weekend.