The Justice Department on Friday threatened to revoke certain federal grants from nine “sanctuary” jurisdictions if they fail to prove they are in compliance with federal immigration law.

The department sent a letter to eight cities and one county warning they could lose federal funds if they continue to limit communication with the Department of Homeland Security about “information regarding the immigration or citizenship status,” the Washington Examiner reported.

Federal statute 8 USC § 1373 prohibits local and state governments from enacting policies that limit such communication with Immigration and Customs Enforcement and Border Protection.