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6 be conclusive” “if supported by substantial evidence.” 48 Stat. 902 (codified, as amended, at 15 U. S. C. §78y).

In the 1930s, this Court upheld the constitutionality of the appellate review model against arguments that it violated the separation of powers and Seventh Amendment. First, in Crowell v. Benson, 285 U. S. 22 (1932), the Court examined the Longshoremen’s and Harbor Workers’ Compensation Act, which authorized administrative agencies to adjudicate workers’ compensation claims against private parties. The Court acknowledged that the case was “one of private right,” id., at 51, but held that Congress had the authority to place primary factfinding authority in an administrative agency, id., at 54. It reasoned that such a scheme did not violate Article III because “Congress has considerable power to structure [judicial] proceedings and to regulate the mechanisms that courts use to ascertain facts.” Nelson 600.

Next, in NLRB v. Jones & Laughlin Steel Corp., 301 U. S. 1 (1937), the Court examined the National Labor Relations Act’s judicial review provisions, which required an Article III court to accept the National Labor Relations Board’s factual findings so long as they were “supported by evidence” in the administrative record. 49 Stat. 454. The Court held that this arrangement did not violate the Seventh Amendment, which provides that “[i]n Suits at common law, where the value in controversy shall exceed twenty dollars, the right of trial by jury shall be preserved.” The Court reasoned that, “because claims seeking statutory remedies for violations of the Act were ‘statutory proceedings’ that were ‘unknown to the common law,’ they were not ‘suits at common law’ within the meaning of the Seventh Amendment.” Nelson 602 (quoting Jones & Laughlin, 301 U. S., at 48; alterations omitted). These cases solidified administrative agencies’ authority “to act as factfinding adjuncts to the