Not so. It was just used in New York City to suppress a possible transit workers' strike. Mayor Giuliani got a judge to issue an injunction fining the union a million dollars and each worker $25,000 for the first strike day, with the fines doubling each day, along with jail time -- not just for striking but for any act or utterance that suggested a strike or even used the word.
At a mass meeting the workers nevertheless voted unanimously to strike, but (to make an interesting story short) their leadership decided to settle for a lot less than the members wanted and were willing to strike for. Giuliani had workers' demonstrations heavily patrolled by cops; and the day after the settlement, the subways were swarming with them, looking out for any hint of a workers' slowdown.
The criminal justice system was used precisely to squelch working-class action. And it succeeded, at least for the moment. (There remains a campaign to reject the proposed contract ....)
I'm sure there are other examples in other places. This just happened to be one I know about firsthand.
Walter Daum