San Diego Unions v. Garmon

Holding that "the States as well as the federal court must defer to the exclusive competence of the National Labor Relations Board" if "an activity is arguably subject to § 7 or § 8 of the [NLRA]"

Bill Johnson's Restaurants, Inc. v. Nat'l Labor Relations Bd.

Holding that the NLRB could not bar an employer from pursuing a well-grounded lawsuit for damages under state law

Farmer v. Carpenters

Holding that an otherwise preempted claim could be prosecuted in state or federal court if the conduct alleged was sufficiently outrageous

Sears, Roebuck Co. v. Carpenters

Holding that both state and federal courts must defer to the National Labor Relations Board when an activity is arguably protected under § 7 or prohibited by § 8 of the NLRA

Linn v. Plant Guard Workers

Holding as preempted all defamation actions in labor disputes except those published with actual malice

Belknap, Inc. v. Hale

Holding that the NLRA does not preempt state law contract actions by replacement workers to enforce terms of an employment contract

Operating Engineers v. Jones

Holding a tortious interference with contract claim preempted

Hanna Mining v. Marine Engineers

Holding that "the Board's statement [that the engineers were supervisors and thus not subject to the NLRA] does resolve the question with the clarity necessary to avoid preemption"

Petrochem Insulation, Inc. v. N.L.R.B

Deferring to the NLRB's citation of a "company's decision to seek treble damages as additional evidence of retaliatory motive" but noting that "had the suit not been so meritless — our view might be different" (citing Kline v. Coldwell Banker Co., 508 F.2d 226, 235 (9th Cir. 1974) (characterizing antitrust treble damages as punitive))

Wright Elec., Inc. v. N.L.R.B