Here's a whole buncha stuff, some not necessarily a direct connection, tho.
Is interesting, nonetheless.
https://www.occrp.org/en/daily/9771-russia-185-million-seized-from-fsb-official-taking-bribes
https://meduza.io/en/news/2019/05/21/russia-s-investigative-committee-has-been-looking-into-a-second-claim-of-high-ranking-fsb-racketeering-for-two-months
https://foreignpolicy.com/2019/05/07/american-held-in-moscow-paul-whelan-says-his-arrest-is-retaliation-for-us-sanctions-russia-vladimir-putin/
https://www.themoscowtimes.com/2019/05/20/russian-regional-court-rules-against-detained-investor-calvey-a65656