Syllabus
ployment of seamen, railroad employees, or any other class of workers engaged in foreign or interstate commerce.” For a court to invoke its statutory authority under §§3 and 4, it must first know if the parties’ agreement is excluded from the Act’s coverage by the terms of §§1 and 2. This sequencing is significant. See, e. g., Bernhardt v. Polygraphic Co. of America, 350 U. S. 198, 201–202. New Prime notes that the parties’ contract contains a “delegation clause,” giving the arbitrator authority to decide threshold questions of arbitrability, and that the “severability principle” requires that both sides take all their disputes to arbitration. But a delegation clause is merely a specialized type of arbitration agreement and is enforceable under §§3 and 4 only if it appears in a contract consistent with §2 that does not trigger §1’s exception. And, the Act’s severability principle applies only if the parties’ arbitration agreement appears in a contract that falls within the field §§1 and 2 describe. Pp. 3–6.
- Because the Act’s term “contract of employment” refers to any agreement to perform work, Mr. Oliveira’s agreement with New Prime falls within §1’s exception. Pp. 6–15.
- (a) “[I]t’s a ‘fundamental canon of statutory construction’ that words generally should be ‘interpreted as taking their ordinary… meaning… at the time Congress enacted the statute.’ ” Wisconsin Central Ltd. v. United States, 585 U. S. ___, ___ (quoting Perrin v. United States, 444 U. S. 37, 42). After all, if judges could freely invest old statutory terms with new meanings, this Court would risk amending legislation outside the “single, finely wrought and exhaustively considered, procedure” the Constitution commands. INS v. Chadha, 462 U. S. 919, 951. The Court would risk, too, upsetting reliance interests by subjecting people today to different rules than they enjoyed when the statute was passed. At the time of the Act’s adoption in 1925, the phrase “contract of employment” was not a term of art, and dictionaries tended to treat “employment” more or less as a synonym for “work.” Contemporaneous legal authorities provide no evidence that a “contract of employment” necessarily signaled a formal employer-employee relationship. Evidence that Congress used the term “contracts of employment” broadly can be found in its choice of the neighboring term “workers,” a term that easily embraces independent contractors. Pp. 6–10.
- (b) New Prime argues that by 1925, the words “employee” and “independent contractor” had already assumed distinct meanings. But while the words “employee” and “employment” may share a common root and intertwined history, they also developed at different times and in at least some different ways. The evidence remains that, as dominantly understood in 1925, a “contract of employment” did not necessarily imply the existence of an employer-employee rela-
