how is forcing someone to join an organization and extorting money from them 'normal'?
if unions are so great, why must they force people to join?
The object of a union is to better the working conditions of its members -and if that happens to involve some measures that might be deemed as distasteful to some as you have outlined here, so be it. The means are more than justified by the ends, considering how far we have come in improving working conditions since the beginning of the industrial era here in the United States. It would not have happened without the emergence of labor unions, and labor unions would not have become as powerful and effective as they later became if they could not employ measures such as these.