Same here in Germany.
An appropriate occasion to inquire into the interests of the working man.
George Reisman addresses the detrimental effect of labour union policies targeting money wages as opposed to real wages:
Labor unions and the general public almost totally ignore the essential role played by falling prices in achieving rising real wages.
Make sure to read the entire article.
Let us assume we live in a perfectly free society, except that everyone is required to pay a modest amount of taxes, say, 1% of a person's income. The regime of freedom keeps working powerfully despite this infringement of total/ideal liberty. Even interventions far more invasive and extensive than this one still leave liberty working powerfully. Presumably labour unions in the richest countries are far more powerful than those in the poorest countries.
Liberty provides us with a huge reserve of wealth which we can use to experiment with all kinds of projects that may include chronically detrimental activities, even some of enormous proportions. However, many such projects are not all-out disasters but more of a mixed bag, combining beneficial and harmful elements. That may well be true of labour unions.
The connection between liberty and reality is complicated. Too complicated for propaganda, one way or another.