Rudy Giuliani tenure as mayor of New York, reduced murders, helped Harlem/South Queens, creating hundreds of thousands of minority jobs, all by targeting thuggery (with stop and frisk), especially in black neighborhoods. So the far left and BLM hate him for that.
reduced homicides by 65% - approximately 7000 black lives spared during his tenure.
created 600,000 jobs most of which went to minorities.