Gavin Newsom’s legislative minions just got a lesson in constitutional supremacy

California's "No Vigilantes Act," signed into law by Governor Gavin Newsom in October 2021, explicitly barred private citizens from reporting undocumented immigrants to federal authorities and imposed criminal penalties on anyone who "willfully" aided Immigration and Customs Enforcement in apprehension activities on state property or at state facilities. The law aimed to shield immigrants from what the state framed as vigilante-style enforcement, but the Ninth Circuit Court of Appeals just delivered a unanimous smackdown: the state cannot legally prevent citizens from cooperating with federal immigration officers or restrict ICE operations through state criminal law. This matters because it dismantles one of California's boldest attempts to obstruct federal immigration enforcement through the machinery of state criminal code.

The mechanics here are worth understanding. The statute threatened up to six months in jail and $1,000 fines for anyone knowingly assisting ICE, which California lawmakers imagined would chill citizen reporting and create de facto sanctuary status. The court's reasoning was straightforward: the Supremacy Clause of the Constitution gives federal immigration law trump authority over state criminal restrictions. You cannot criminalize helping a federal agent do his job within the constitutional domain assigned to federal authorities. California's legislature thought it could use state criminal penalties as a workaround to federal immigration policy—the court said no, not how this works.

The stakes are concrete and practical. Newsom's approach was designed to empower state officials to actively resist federal immigration enforcement. If sustained, the "No Vigilantes Act" would have created legal jeopardy for anyone—a landlord reporting an illegal tenant, a neighbor calling ICE, a family member turning in a fugitive—who facilitated federal immigration operations. It would have established a precedent for states to criminalize cooperation with federal law enforcement in specific domains, effectively nullifying federal agency operations through state obstruction. The Ninth Circuit's unanimous decision signals that states cannot use their police power to block citizens from exercising federal rights or assisting federal agencies in their statutory duties.

This echoes the nullification debates of the 1830s, when South Carolina attempted to invalidate federal tariff law within its borders—except modern California tried it through criminal statute rather than naked legislative assertion. Both involved a state claiming power to block federal enforcement. Both lost.

The conservative read is straightforward: Newsom attempted an end run around federal immigration authority using state criminal law as a cudgel. He wanted to create criminal liability for Americans cooperating with federal agents—transforming state government into an active impediment to federal law enforcement rather than a neutral party. The Ninth Circuit correctly recognized this as an unconstitutional overreach. Federal immigration authority exists because Congress granted it; states cannot use criminal penalties to override that authority, no matter how much their voters dislike the outcome. This is the Supremacy Clause doing exactly what it was written to do.

Watch for Newsom's next legislative move. California will likely appeal or attempt to craft a narrower law that doesn't directly criminalize cooperation with ICE but instead restricts state resources from cooperating—a technical distinction that may or may not survive further scrutiny. The Trump administration's immigration enforcement posture, once in full gear, will probably accelerate litigation over similar state obstruction laws in New York, Illinois, and other jurisdictions. The deadline that matters is whether California chooses to appeal this decision to the Supreme Court, though the unanimous Ninth Circuit verdict and clarity of Supremacy Clause precedent make reversal unlikely.