In Australia there is still a reasonable amount of unionisation, although membership percentages dropped off markedly when a past government sharply curtailed union powers. In particular, the "right to strike" as understood by much of the developed world is now restricted to only certain circumstances; basically, we can only strike once every few years when negotiating for a new agreement.
Once the agreement is in place, taking collective action against hostile management makes you a target for civil liability. (Which isn't to say it doesn't happen, but the threat of civil damages certainly has a chilling effect whenever the prospect of "unprotected action" is raised.)