Yes, it is unlawful to attack, threaten, or harass retired federal law enforcement officers on account of their past duties, and making false, fictitious, or fraudulent allegations against them is a severe crime under U.S. federal law. [1, 2]

Federal Protections and Statutes

• Retaliation against Former Officials: Under 18 U.S.C. § 115, it is illegal to assault, kidnap, murder, or threaten—or attempt to do so—any current or former federal employee (including federal law enforcement) in retaliation for the performance of their official duties. [1, 2, 3]
• False Claims and Reports: Presenting false, fictitious, or fraudulent claims to any federal agency is a felony under 18 U.S.C. § 287, punishable by up to 5 years in federal prison. [1, 2]
• False Statements to Law Enforcement: Knowingly and willingly making materially false, fictitious, or fraudulent statements to federal investigators or within federal jurisdiction is a felony punishable by up to 5 years in prison under 18 U.S.C. § 1001. [1, 2, 3]

Civil Implications

In addition to federal criminal prosecution, the targets of false accusations or unlawful attacks may pursue civil action against the offending party, which can include claims for defamation (libel or slander) and malicious prosecution. [1, 2, 3, 4, 5]