www.goldinglawyers.com/irs-criminal-investigation-cid-irs-fraud-division-offshore-money/?utm
www.irsstreamlinedprocedures.com/irs-criminal-investigation/
See also:
globalinvestigationsreview.com/guide/the-practitioners-guide-global-investigations/2021/article/co-operating-the-authorities-the-us-perspective
tinyurl.com/trypx62z