A federal appeals court has reversed a Milwaukee man's gun conviction and three year sentence, ruling that police unlawfully boxed him into an alley with their bicycles. The ruling -- the same day that law enforcement officials declared a new war on gun violence in Milwaukee”-- illustrates the kind of legal obstacles such an effort must overcome. The 7th U.S. Circuit Court of Appeals opinion was written by Judge Anne Williams, and joined by Judge Richard Posner and U.S. District Judge Andrea Wood. In June 2013, Milwaukee officers Michael Michalski and Michael Flannery were bicycle patrol on the city’s north...