The conservative assault on the administrative state has four elements.

First, Justices Gorsuch and Thomas want to revive a discredited legal rule that was invoked by the Supreme Court in 1935 and then abandoned. The “nondelegation doctrine” says that Congress may not “delegate” its legislative power to administrative agencies — in other words, authorize agencies to make policy through regulation. That doctrine is at issue again in the Gundy case, where the challengers argue that Congress gave the attorney general too much discretion to set the rules for sex offenders.

Second, Justices Gorsuch, Kavanaugh and Thomas want to undermine a rule called the Chevron doctrine, after a 1984 Supreme Court case. That rule says that when an agency regulation is based on a reasonable interpretation of a statute, courts should “defer” to the agency. The Chevron rule codified existing judicial recognition of the core idea of the administrative state. Specialists — in environmental hazards, in credit markets, in workplace safety — should regulate. Generalist judges, who end up disagreeing with one another and causing administrative confusion, should keep their hands off. The Chevron doctrine is at issue in the Nielsen case, where the challengers have urged the court not to defer to the government’s interpretation of the immigration statute.

Third, the conservative justices dislike the principle of agency autonomy and have looked askance at job protections for agency officials.

Fourth, the conservative justices have endorsed a novel interpretation of the First Amendment that protects businesses from regulation — from campaign finance regulation, labor regulation and even regulations that require them to disclose information to consumers.

What is the basis for this radical change in the law? Justices Kavanaugh, Gorsuch and Thomas claim to be “originalists,” who believe that the court should strike down laws that violate the original understanding of the Constitution. But the founders did not bar Congress from creating administrative agencies or think that the First Amendment protected businesses from commercial regulation.

Many liberals think that the conservative justices are cat’s paws of business. But their claims to the contrary, businesses do not oppose regulation. Businesses constantly beseech the agencies to regulate — not themselves, but the other businesses that they compete with or depend on, and are harmed by. The new conservative jurisprudence may help some businesses in the short run but ultimately will undermine the legal structure in which they flourish.

The answer is both obvious and depressing. The modern conservative jurisprudence is an exercise in nostalgia, a yearning for pre-New Deal America when, supposedly, government was less oppressive and people were freer than they are today. You can see this nostalgia in the homilies to olden times in Justices Gorsuch’s and Kavanaugh’s lectures — and their insistence that answers to today’s challenges can be found in a theory of government invented in the 18th century by men wearing breeches and powdered wigs.