A 42-year-old South Carolina man has pleaded guilty to sending a threatening letter to a federal judge through the mail from his jail cell. According to court documents, Alvin Bernard Parks, 42, is alleged to have sent a letter to a specifically named United States District Court Judge for the District of South Carolina. According to the Department of Justice, the handwritten letter contained threats to harm the judge. An excerpt from the letter reads: “I have watched you leave the courthouse numerous times and plotted to get my revenge.” The letter goes on to say, “you best to make sure they …