The problem is also with agency "temporary" staff, that are not so temporary. They cost a lot more than permanent workers, don't get any of the benefits earned so hard over so long a time and all the extra money goes to the agency itself to make a killing. And also they are less likely to be good workers because of the nature of their hiring.

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Trust me, I'm a socialist!

There's power in a factory,power in the land, power in the hand of the worker. But it all amounts to nothing if together we don't stand, there is power in a union.
The union forever defending our rights, down with the blackleg, workers unite. To our brothers and our sisters in many far off lands, there is power in a union.
Money speaks for money, the devil for his own. - Billy Bragg