Syllabus

NOTE: Where it is feasible, a syllabus (headnote) will be released, as is being done in connection with this case, at the time the opinion is issued. The syllabus constitutes no part of the opinion of the Court but has been prepared by the Reporter of Decisions for the convenience of the reader. See United States v. Detroit Timber & Lumber Co., 200 U. S. 321, 337.

SUPREME COURT OF THE UNITED STATES

Syllabus

GLACIER NORTHWEST, INC., DBA CALPORTLAND v. INTERNATIONAL BROTHERHOOD OF TEAMSTERS LOCAL UNION NO. 174

CERTIORARI TO THE SUPREME COURT OF WASHINGTON

No. 21–1449. Argued January 10, 2023—Decided June 1, 2023 Glacier Northwest delivers concrete to customers in Washington State using ready-mix trucks with rotating drums that prevent the concrete from hardening during transit. Concrete is highly perishable, and even concrete in a rotating drum will eventually harden, causing sig- nificant damage to the vehicle. Glacier’s truck drivers are members of the International Brotherhood of Teamsters Local Union No. 174. Af- ter a col