You can download the text from here. From the text:
Organized labor is, apart from the state, probably today the only legal subject entitled to exercise violence. Against this view there is certainly the objection that an omission of actions, a nonaction, which a strike really is, cannot be described as violence. Such a consideration doubtless made it easier for a state power to conceive the right to strike, once this was no longer avoidable. But its truth is not unconditional, and therefore not unrestricted. It is true that the omission of an action, or service, where it amounts simply to a “severing of relations,” can be an entirely nonviolent, pure means. And as in the view of the state, or the law, the right to strike conceded to labor is certainly not a right to exercise violence but, rather, to escape from a violence indirectly exercised by the employer, strikes conforming to this may undoubtedly occur from time to time and involve only a “withdrawal” or “estrangement” from the employer. The moment of violence, however, is necessarily introduced, in the form of extortion, into such an omission, if it takes place in the context of a conscious readiness to resume the suspended action under certain circumstances that either have nothing whatever to do with this action or only superficially modify it. Understood in this way, the right to strike constitutes in the view of labor, which is opposed to that of the state, the right to use force in attaining certain ends.
You can download a doco on Walter Benjamin, if you’re interested. A preview of the film is after the break.