Hundreds of lefty demonstrators marched through downtown Madison, Wisconsin, spewing anti-cop venom, stopping traffic and harassing diners as they protested the killing of Corey Ruiz, a career criminal who allegedly stabbed a police officer with a knife before being shot. Nearly 500 people marched from the intersection of Williamson Street and South Baldwin Street — where the 38-year-old was shot three times on Wednesday during a struggle with several police officers — to the Madison Police Department headquarters on Friday. Video showed some demonstrators stopping traffic and confronting at a female motorist who insisted she was an “ally” during a...