As part of the sweep, Occupy claims, police officers seized approximately 3,600 books from the "People's Library" that had been donated to the movement. The protesters claim only 1,000 were returned, 200 of them in unusable condition - including a copy of Mayor Michael Bloomberg's autobiography. "To this day, OWS has not been told by the City of New York what happened to the missing books and the Library furnishings and equipment," according to the lawsuit, which was filed in Manhattan federal court. Norman Siegel, one of the lawyers representing Occupy, said other cities that conducted similar crackdowns went to court before seizing property, a step that New York chose to skip. "This is a David vs. Goliath lawsuit," he said. We're confident that we will prevail. Kate O'Brien Ahlers, a spokeswoman for the city's law department, said the city was waiting to be served with a copy of the lawsuit before commenting. The lawsuit alleges several constitutional violations, including due process and unreasonable seizure claims. It names Bloomberg, police Commissioner Raymond Kelly, the city's sanitation chief and unnamed workers who may have destroyed the books. Michele Hardesty, 34, an associate professor at Hunter College in New York and one of the Occupy librarians, said the movement had carefully cataloged every book and could document each missing item. Reporting by Joseph Ax; Editing by Doina Chiacu and Vicki Allen