18 U.S. Code § 3521 - Witness relocation and protection
It is possible Ivana, Abe and others (JFK Jr.?) are participating in WITSEC. The program is run by the US Marshall's not the FBI. The program was expanded to include foreign nationals, as part of law enforcement involving international crime cartels involved in child trafficking, drug running and corruption. Participants are selected by the US Attorney General, so if this is what's going on to protect family members and those who might be witnesses were probably approved by Barr as part of a Continuity of Government operation set in motion after the POTUS Declaration of Emergency in the wake of the 2020 elections.
https://www.mentalfloss.com/article/649685/witness-protection-program-facts