You have $1M in dirty money. Wire it to Tether for some Tethers. Go on Bitfinex and buy lots of bitcoin. Transfer the bitcoin to a legitimate exchange. Sell for clean USD.
This could be a very valuable (and lucrative) service in certain circles, I have no doubt. One thing that could jeopardize the livelihood (...and lives?) of people running a business in this space would be a steeply falling Bitcoin price. They would probably do anything to keep the price up. Like issuing more magic tethers and buying Bitcoin with them.