Nancy Grace comes to mind, who has far more reach being on national television. She made claims about people who were later found to be guilty. Her speculation pushed harassment.
Alex Jones has far more listeners than Nancy Grace has ever had. He was pulling down 8 figures selling fake boner pills and tin foil hats on his merch website.
I'm unable to find a number about how many people listened to him around the time period, but still arguably, she was a very well known public figure, even if some people didn't watch her. My mom would watch her show religiously.