Bitcoin Fog, the first major Bitcoin mixing and tumbling service, goes live on the dark web. The service allows users to obscure the origin of their Bitcoin transactions by pooling and redistributing coins among multiple users. It sparks an ongoing debate about financial privacy versus money laundering that continues to this day. Bitcoin Fog operates for nearly a decade before its alleged operator, Roman Sterlingov, is arrested by the IRS in 2021 and later convicted.
Wikipedia: Bitcoin Fog