Saying the mayor’s refusal to wrest control of the city’s workers compensation division has allowed Chicago’s most powerful alderman to turn the office into a political patronage “army,” giving preferential treatment to loyal city workers, a lawsuit brought by a city worker who helped expose the Hired Trucks scandal has asked a federal judge to declare unconstitutional Ald. Ed Burke’s management of the office that handles Chicago city workers’ workers comp claims, and force Mayor Rahm Emanuel to oversee operations there, despite city rules delegating the task to Burke.