NLRA section 301 completely preempts state law claims that implicate a collective-bargaining agreement or an agreement between labor organizations, except for claims that (1) arise independently of the agreement, and (2) don’t substantially depend on analysis of the agreement. Here, union members of a Nevada local sued to challenge the national union’s placing the local into trusteeship. The union members’ claims arose from and depended on the contract by which the Nevada local affiliated itself with the national union and the local union’s constitution. The union members’ state law claims were, therefore, preempted by NLRA section 301.