“Theoretically it is, indeed, asserted that the relation between employer and employee is based upon a contract for the accomplishment of a definite purpose. The purpose in this case is social production. But a contract has meaning only when both parties participate equally in the purpose. In reality, however, the worker has today no voice in determining production, for this is given over completely to the employer. The consequence is that the worker is debased by doing a thousand things which constantly serve only to injure the whole community for the advantage of the employer.”