It's the first action of its kind by FinCEN, which assessed that the Helix and Coin Ninja services failed to file suspicious activity reports and follow other financial rules.

It’s only the latest in a series of international sting operations against illicit underground commerce.

Drugs, not malware, are the most popular items sold on dark web markets.

The increase coincides with heightened law enforcement activity targeting online drug market.

The dark web marketplaces you heard of are probably filled with cops and researchers.

International authorities have arrested dozens of accused dark web vendors in recent months.