WASHINGTON – On Thursday, the United States filed a complaint against the State of New York, challenging state policies that blocked immigration officials from arresting individuals at or near New York courthouses. Specifically, the complaint challenges a law, called the Protect Our Courts Act, that purposefully shields dangerous aliens from being lawfully detained at or on their way to or from a courthouse and imposes criminal liability for violations of the shield. This law and accompanying polices violate the Supremacy Clause of the U.S. Constitution because they obstruct the execution of federal immigration authorities.