A barrage of threatening mail that prosecutors say terrorized Jewish institutions in several states has landed a Maryland man in federal prison. On Monday, March 16, 2026, a federal judge in Philadelphia sentenced Clift Seferlis, 55, of Garrett Park, Maryland, to more than three years behind bars for mailing dozens of threatening letters and postcards to Jewish institutions, including the Weitzman National Museum of American Jewish History. After serving his 37 months, Seferlis will also be on supervised release for three years. Prosecutors say his campaign zeroed in on synagogues, museums, schools and community centers across multiple states.
Sentence and penalties
Judge Mark A. Kearney handed down a 37-month prison term, along with a $40,000 fine and a $2,200 special assessment. Prosecutors announced those penalties, according to NBC10 Philadelphia.
Plea and mailing campaign
Seferlis pleaded guilty on Nov. 17, 2025, to 17 counts of mailing threatening communications and eight counts of obstructing the free exercise of religious beliefs. He admitted to sending at least 40 letters and two postcards to more than 25 Jewish institutions, prosecutors said. As detailed by the U.S. Attorney’s Office for the Eastern District of Pennsylvania, the messages included threats to destroy buildings and to injure individuals, reaching recipients from Philadelphia to Washington, D.C.
Investigators and community response
The Weitzman said its staff were among those targeted and, together with the Jewish Federation of Greater Philadelphia, publicly thanked the FBI, the Secure Community Network and other partners for what it called "coordinated work" after the sentence came down. U.S. Attorney David Metcalf framed the case in broader terms, calling such threats "attacks not just on those communities but on the freedoms guaranteed to all Americans," according to NBC10 Philadelphia.
Legal charges and statutes
Federal law makes mailing threats a crime. Under 18 U.S.C. §876, using the U.S. mail to transmit a true threat can be prosecuted, and 18 U.S.C. §247 criminalizes obstructing the free exercise of religion by force or threats against religious property. Penalties vary depending on the circumstances, including longer terms if injury, death or the use of weapons or explosives is involved, as reflected in the statutory text.
Why it matters
Prosecutors and community leaders said the case highlights how federal officials are prioritizing threats to religious institutions at a time of rising concern about antisemitic incidents. The Justice Department's hate-crimes news page lists other recent federal prosecutions in similar cases, and Seferlis’s guilty plea was previously reported in November.
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