The U.S. Supreme Court on Thursday declined to block enforcement of an anti-money laundering law that forces millions of business entities to disclose the identities of their real beneficial owners to the Treasury Department,

Owners and part-owners of an estimated 32.6 million small businesses must register personal information with Treasury’s Financial Crimes Enforcement Network, or FinCEN.

A Texas judge blocked the federal government from enforcing a duly enacted act of Congress at the behest of business interests fighting financial transparency efforts.