FBI agents and local law enforcement agencies in Montana, Oregon and Michigan were able to track and ultimately locate the suspect because of the work of Jonathan Hutson, the chief spokesman for the Brady Campaign.

“Of all the people on Twitter with whom this white supremacist chose to tangle, he picked me,” Hutson told Hatewatch today. “I just happen to be a spokesman for the Brady Campaign Against Gun Violence and I have a background as an investigative journalist.”

Hutson has 53,000 followers on his Twitter account. Lenio, using the handle @PyschicDogTalk, responded after Hutson posted a Twitter message about double killings at a free-speech event and a synagogue on Saturday in Copenhagen, Denmark.

Since last Thursday, Hutson learned, the Holocaust-denying Lenio has tweeted comments saying he wants to execute 30 or more “grade school students” and “shoot up a school” and a synagogue, and put “two in the head” of a rabbi or Jewish leader. He also said he hoped to go on a killing rampage until “cops take me out.”

More: Man Arrested in Montana After Alleged Threats to Kill School Children and Jews