Because financial institutions have a front-row seat for watching the country’s cash flow, financial institutions are obligated to alert regulators and law enforcement through a Suspicious Activity Report if there’s irregular behavior that they cannot easily explain.

Individual financial institutions must answer to a bureau of the Treasury Department called the Financial Crimes Enforcement Network, or FinCEN. Its job is to safeguard the financial system against criminal activity, including money laundering and terrorism financing.

“It is held to a high level of confidentiality, and it is a crime to disclose that a SAR has been filed,” Cohen Levin said.

https://news.yahoo.com/banks-closing-customer-accounts-little-141130517.html