A New Jersey blogger is being prosecuted for making death threats to federal judges. Hal Turner, who was arrested in June, is to go on trial in New York Tuesday. The death threats he made were targeted toward federal appeals judges Richard Posner, Frank Easterbrook, and William Bauer.

Turner claims that all his statements and postings were “part of an undercover operation to ferret out violent left-wing radicals.”

According to The Associated Press, Hal Turner was connected with FBI since 2003, and received thousands of dollars from the bureau for posting threats in his blog and putting inflammatory statements on his radio show.

According to The Record of Bergen County, FBI paid Turner to “report on neo-Nazis and white supremacist groups” and has even sent him undercover to Brazil. The FBI has not commented on the case yet.