From annual FOIA Report (2019] Dept. of State
Statute: Fed. R. Crim. P. 6(e), enacted by Act of July 30, 1977, Pub. L. No. 95-78, §2, 91 Stat. 319
Type of information withheld: Certain records that would reveal some secret aspect pertaining to grand jury proceedings.
Agency/Component: OIG
Used by Agency:1
p.11 of 42
https://foia.state.gov/Learn/Reports/Annual/2019.pdf
The case citations might lend more of a clue for lawfags. I’m gonna sniff around other agency reports and see if I can locate any connections.