The Financial Crimes Enforcement Network (FinCEN) is the regulatory and enforcement agency tasked with combatting money laundering, financing of terrorism, fraud, and other financial crimes.
"Know Your Customer" or "Know Your Client" (KYC) is the obligation of banks, businesses, and other financial institutions to identify and authenticate a person's identity before doing business with them. KYC encompasses three pillars: identification and due diligence, and ongoing monitoring.