Thousands of nurses and other protesters gathered [on May 18] at a downtown Chicago plaza for a noisy but peaceful demonstration demanding a Robin Hood" tax on banks' financial transactions. Members of National Nurses United, the nation's largest nurses union, were joined by members of the Occupy movement, unions and veterans at the rally city officials have said could attract more than 5,000. The nurses and their supporters dressed in red shirts and wore green felt Robin Hood caps with red feathers. The rally - which originally was scheduled to coincide with the start of the G-8 economic summit before it was moved from Chicago to Camp David - drew a broad spectrum of causes, from anti-war activists to Occupy protesters. Meanwhile, lawyers for NATO summit protesters said police on [May 18] released four of nine activists arrested ... on accusations that they had or planned to make Molotov cocktails. The lawyers said police, with their guns drawn, raided an apartment building where activists were staying and arrested nine people. The Chicago chapter of the National Lawyers Guild said officers broke down doors in the building in the South Side Bridgeport neighborhood and produced no warrants. "The nine have absolutely no idea what they're being charged with because they were not engaged in any criminal activity at all," said guild attorney Sarah Gelsomino. "They're really very confused and very frightened." The Chicago Police Department refused to comment.