"The right of free association, which is pleaded on behalf of collective price-fixing by trade unions, means nothing unless there is an equal right of non-association. It is contrary to the Rule of Law that any private association of citizens should be permitted to exercise, let alone to be endowed with the positive power to exercise, coercion over those who do not choose to belong to it. This power of coercion derives primarily from the legal privileges which trade unions, and trade unions uniquely, have enjoyed for the last sixty years, privileges which enable them to behave in ways that for any other associations would be unlawful and would result in damages for those who suffered injury at their hands... [N]o one has succeeded in showing that today these coercive powers are other than superfluous at best and at worst harmful, and that...the state of the law on which those privileges rest is ripe for urgent reform. The law of picketing, intimidation, contracting-out, immunity from process is not at this day defensible, either in itself or in its economic consequences. When combination to fix the price of labour enjoys no privileges which are denied to combinations for the purpose of fixing other prices, then the right of free association will be a reality and not a phrase, and one of the most serious obstacles will have been removed which impede at present the use of this nation's abilities and resources for the benefit of all her people."