Collective Bargaining Westwood Industries is a company specializing in sheet metal fabrication. Most of its employees are members of the National Metal Workers Union (NMWU). Westwood and NMWU are negotiating a collective bargaining agreement. After extensive good faith efforts, the parties have reached an impasse. NMWU leadership believe their proposals are fair and justifiable. They see no choice but to commence a strike against Westwood. When the strike begins, NMWU demands a 10% increase in wages and contacts local media outlets to support their cause. NMWU members also form a barrier that denies nonunion workers access to the plant. Finally, NMWU workers organize an immediate sit-down strike inside the plant. Are these tactics permissible?