FBI Director James Comey had this about Huma Abedin and her role in the ex-Secretary of State Hillary Clinton (D) classified email scandal:

Somehow, her [Clinton’s] emails were being forwarded to Anthony Weiner, including classified information.  His then-spouse, Huma Abedin, appears to have had a regular practice of forwarding emails to him for him to print out for her, so she could deliver them to the secretary of state.

Comey justified his lack of action with this:

We didn’t have any indication that she had a sense of what she was doing was in violation of the law[.]

There is, however, no requirement for mens rea under the relevant law; if nothing else Abedin’s actions fit the law’s gross negligence felony charactistic.

With such a bold, declarative statement about what Abedin was doing, then, I have to wonder why there’s been no indictment and subsequent prosecution.

Probably for the same reason he declined to bring a case against Clinton after having said her actions were excessively careless: it’s not politically expedient.