https://www.forfeiture.gov/pdf/DEA/OfficialNotification.pdf
https://www.forfeiture.gov/pdf/FBI/OfficialNotification.pdf
https://www.forfeiture.gov/pdf/USPS/OfficialNotification.pdf
https://www.forfeiture.gov/pdf/USSS/OfficialNotification.pdf
https://www.forfeiture.gov/pdf/USAO/OfficialNotification.pdf
https://www.forfeiture.gov/pdf/CBP/OfficialNotification.pdf
https://www.forfeiture.gov/pdf/ATF/OfficialNotification.pdf
Check out the latest Bitcoin Seizures for the past month here. They are large documents so Ctrl-F (Find in Page) and type Bitcoin. Check and see if any of the names or Bitcoin Addresses seized from look familiar. It's updated every month.
This should be PRELIMINARY work for any and all participants of the DNMs. You'd be surprised at the amount of people still operating that will show up on that list from time to time. If I were you, I wouldn't want to be dealing with them.
They publish these letters every month, so fetch it / cache it.
Could you list the bitcoin companies that'd be dank.