The head of one of Chicago’s police unions estimated that more than 3,000 officers are refusing to comply with the city’s COVID-19 vaccine reporting mandate, coming as the city sent out several threatening memos to officers in recent days. “The unofficial number we have is about over 3,200″ or “about a third of the department,” Fraternal Order of Police President John Catanzara told CBS Chicago. Over the weekend, the city said that all city workers need to report their vaccination status. On Monday, officers who won’t report their vaccination status could be immediately suspended without pay, Catanzara predicted. But the citywide mandate, he argued, is illegal because Mayor Lori Lightfoot’s administration didn’t negotiate with the union. A memo sent by top officials in the Chicago Police Department to staff on Sunday threatened the firing of officers who refuse to comply with the city’s vaccine policy. Police officers who retire while under investigation could …