Fifty years ago, Congress passed the Fair Housing Act. The act outlawed housing discrimination based on race and other classifications.But two years before the law passed, Alexander Polikoff of the nonprofit Business and Professional People for the Public Interest took the fight against rampant racial discrimination in Chicago’s public housing to the courts.Last week, the U.S. District Court’s 19th annual Awards for Excellence in Pro Bono and Public Interest Service honored BPI and Polikoff for the lawsuit …