Petitioner Granite Rock Company is a concrete and building materials company that has operated in California since 1900 and employs approximately 800 employees under labor contracts with several unions, including respondent International Brotherhood of Teamsters, Local 287.
Granite Rock and Local were parties to a 1999 collective-bargaining agreement that expired in April 2004. After negotiations reached an impasse, Local members initiated a strike on June 9, 2004, in support of their contract demands.
The strike continued until July 2, 2004, when the parties reached agreement on the terms of a new collective-bargaining agreement containing a no-strike clause and an arbitration clause. At the end of that negotiating session, Local's business representative approached Granite Rock about executing a separate back-to-work agreement that would hold union members harmless for damages incurred during the June 2004 strike, but no such agreement was executed and Local voted to ratify the new agreement on July 2 without it.
Respondent IBT, which had advised Local throughout the negotiations and supported the June strike, opposed Local's decision to return to work without a hold-harmless agreement and instructed Local's members not to honor their agreement to return to work on July 5. On July 6, 2004, Local's representative demanded a hold-harmless agreement, but Granite Rock refused and informed Local that continued strike activity would violate the new agreement's no-strike clause. IBT and Local responded by announcing a companywide strike involving numerous facilities and hundreds of workers, including members of other IBT locals.
IBT provided pay and benefits to members who refused to return to work, directed Local's negotiations, supported Local with a $1.2 million loan, and represented that it had unilateral authority to end the work stoppage in exchange for a hold-harmless agreement. On July 9, 2004, Granite Rock sued IBT and Local in the District Court, invoking federal jurisdiction under LMRA § 301(a), seeking strike-related damages for breach of contract, and requesting an injunction against the ongoing strike on the ground that the hold-harmless dispute was an arbitrable grievance.
The unions conceded § 301(a) jurisdiction but asserted that the new agreement was never validly ratified on July 2. After a Local member testified that the new agreement had been put to a ratification vote on July 2 and unanimously approved, Granite Rock moved for a new trial. On August 22, while that motion was pending, Local conducted a second successful ratification vote, and on September 13 the unions called off the strike. The District Court granted Granite Rock a new trial on its damages claims, denied Local's motion to send the ratification-date dispute to arbitration, and submitted the question to a jury, which unanimously found that Local ratified the agreement on July 2, 2004.
The District Court entered the verdict and ordered arbitration on Granite Rock's breach-of-contract claims. Granite Rock amended its complaint to add federal tortious-interference claims against IBT, which the District Court dismissed on the ground that § 301(a) supports a federal cause of action only for breach of contract. The Ninth Circuit affirmed the dismissal of the tortious-interference claims but reversed the arbitration order, holding that the ratification-date dispute was a matter for an arbitrator to resolve under the agreement's arbitration clause. The Supreme Court granted certiorari.
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