There are heavy limitations on union industrial action in Australia that make this sort of thing much more likely to happen. It's a tremendously contrived system and as a result Unions often up very chummy to the employer as elements which may be more amenable to confrontation can get frustrated with the immense complexity and difficulty that brings. Any kind of industrial action used for bargaining is almost impossible to get authorized. I'd say the Australian union system is one of the worst in the world, and most Australian unions are structurally busted.