Michigan Forward says that more than 500 people have signed up to circulate petitions calling for a referendum on Public Act 4 — the Emergency Manager law. “Since our presentation to the city of Pontiac on May 12, our volunteer capacity has increased to over 500 volunteers in our focus communities: Ann Arbor/Ypsilanti, Benton Harbor, Detroit, Flint, Grand Rapids, Pontiac, Lansing, Traverse City, Saginaw, Southfield and Warren,” the progressive think tank said in a statement. The March 16 law was cast as a measure to address the state’s growing economic problems and allows emergency managers to take over towns and schools, fire elected officials, sell public property, end collective bargaining and privatize services.