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Some criminal groups use a process called trade-based money laundering to hide their illicit funds. These schemes can include things like falsely describing goods and services in trade transactions.
Schemes can involve many types of illicit activity that cut across multiple federal agencies' roles.
Many federal agencies like the National Park Service and Federal Aviation Administration rely, in part, on user fees. In FY 2019, federal agencies collected over $100 billion in fees dedicated to specific purposes like park maintenance and airport improvements.