Holding that Section 301 gives a federal court jurisdiction over a suit to enforce an arbitration clause in a collective bargaining agreement even if the case is "truly a representation case" that could also be heard by the NLRB under Section 9 of the NLRA
In Soft Drink Workers Local 812 v. NLRB, 657 F.2d 1252 (D.C.Cir. 1980), a union violated section 8(b)(4)(B) by picketing a distributor of nonlocal products to enhance the job opportunities of union members at local plants, id. at 1260; its picketing was thus "tactically calculated to satisfy union objectives elsewhere."
In Electro-Coal, we held that "statements by union officials to the effect that there would be `problems' or `serious problems'" were "ambiguous and do not constitute threats unless accompanied by economic actions such as strikes or picketing that resolve the ambiguity."