Casper man faces prison time for making threats by phone

CASPER (WNE) — A Casper man is facing 366 days in federal prison after being convicted of making antisemitic threats to Anti-Defamation League offices.

Derek Fulfer, 31, has also been ordered to complete two years of supervised release after serving his year-and-a-day sentence.

Under U.S. code, the maximum prison sentence for making interstate threats is five years.

A news release from the Department of Justice indicated Fulfer called the Anti-Defamation League four times "in immediate succession" and left voicemails with "antisemitic slurs" and threats of violence "against persons of the Jewish faith" when they weren't picked up.

"The defendant stated during his interview with the FBI that he had a constitutional right to free speech but let me make it very clear that true threats of violence are not protected by the First Amendment," U.S. Attorney Darin Smith said. "The voicemails he left for the ADL were indeed threatening and caused great concern for ADL employees. This behavior is unacceptable, and we will prosecute these cases to the fullest extent of the law.

Charges were filed against Fulfer in August 2025 and he pleaded guilty this January, prosecutors said.

This story was published on April 11, 2026.