The Financial Crimes Enforcement Network (FinCEN) is like a detective for the government. FinCEN helps stop people from doing illegal things with money. FinCEN looks for patterns in money that might show someone is breaking the law. For example, if one person keeps sending small amounts of money to another person, FinCEN would wonder why and might investigate. They also help track money that is used to buy illegal things, like drugs or guns. FinCEN works with banks and other financial companies to make sure the money they are handling is not being used for bad things.