Wyoming Man Sentenced for Threats Against Denver ADL Office

Casper resident Derek A. Fulfer made multiple violent, anti-Semitic calls to ADL offices in Colorado and Texas.

Apr. 12, 2026 at 10:11pm

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An extreme close-up photograph of a twisted, damaged metal object against a pitch-black background, conceptually representing the threats made against the Anti-Defamation League offices.A shattered remnant of the anti-Semitic threats that targeted the Anti-Defamation League, exposing the harsh reality of intolerance.Denver Today

A Casper, Wyoming man has been sentenced to 12 months and one day in prison for making multiple violent and anti-Semitic threats against the Anti-Defamation League (ADL) offices in Denver, Colorado and Austin, Texas in 2025. Derek A. Fulfer admitted to making the threatening calls, which included antisemitic slurs and demands to be put on a 'ban list' for anti-Semitic people.

Why it matters

Threats of violence against religious and minority communities are a serious concern, as they can create an atmosphere of fear and intolerance. The ADL works to combat anti-Semitism and other forms of bigotry, so threats against their offices strike at the heart of their mission to protect vulnerable groups.

The details

According to court documents, Fulfer made multiple calls to the Denver ADL office and one call to the Austin office in March 2025. The calls were filled with antisemitic language and threats of violence against Jewish people. Fulfer denied the Holocaust and claimed that Hitler is 'coming back' to 'destroy the Jewish people'. The FBI identified Fulfer as the caller, and he admitted to making the threats, though he believed they were protected speech.

  • In March 2025, Fulfer made multiple threatening calls to the ADL offices in Denver and Austin.
  • On January 8, 2026, Fulfer waived indictment and pleaded guilty to transmitting threats in interstate commerce.
  • On April 3, 2026, Fulfer was sentenced to 12 months and one day in prison, followed by two years of supervised release.
  • Fulfer was ordered to self-surrender to the Bureau of Prisons by June 1, 2026.

The players

Derek A. Fulfer

A Casper, Wyoming resident who was sentenced to prison for making violent, anti-Semitic threats against the Anti-Defamation League offices in Denver and Austin.

Darin Smith

The U.S. Attorney for the District of Wyoming, who condemned Fulfer's actions and vowed to prosecute those who threaten religious communities.

Anti-Defamation League (ADL)

A non-profit organization that works to combat anti-Semitism and other forms of bigotry, which was the target of Fulfer's threatening calls.

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What they’re saying

“Jewish Americans have every right — not as a courtesy, not as a privilege, but as Americans — to live, to worship, and to serve their communities free from threats of violence. Let there be no confusion about what happened here. This was not political commentary. This was not satire. This was not protected speech. This was a calculated attempt to terrorize people because of their faith. And it failed.”

— Darin Smith, U.S. Attorney for the District of Wyoming

What’s next

The judge ordered Fulfer to self-surrender to the Bureau of Prisons by June 1, 2026 to begin serving his 12-month and one-day sentence.

The takeaway

This case highlights the ongoing threat of anti-Semitism and the need for vigilance in protecting religious and minority communities from violence and intimidation. The swift prosecution of Fulfer sends a strong message that such threats will not be tolerated.