https://www.justice.gov/archives/jm/criminal-resource-manual-1601-background-18-usc-351

GSA Executive Mentioned Threats to Her, Her Family, and Employees

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It should also be noted that family members of all Federal employees are now protected by § 115(a)(1) of Title 18 against assault, kidnapping, and murder, as well as attempts or threats to assault, kidnap, or murder. However, such violent acts must be done "with the intent to impede, intimidate, or interfere with" such Federal employee "while engaged in the performance of official duties, or with intent to retaliate against" such Federal employee.

Section 115(a)(2) of Title 18 covers threats against all Federal employees, including those covered by § 351, when such threat is done "with intent to impede, intimidate, or interfere with" such Federal employee "while engaged in the performance of official duties, or with intent to retaliate against" such Federal employee.