How is the trade union movement prior to World War I best described?

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The trade union movement prior to World War I varied from country to country but was generally allied with socialist parties. While trade unions were banned in some countries, they were still able to organize and grow in others. The peak of their strength during this time was in Germany, where they were instrumental in forming the Social Democratic Party. However, they also played significant roles in other countries such as France and Britain.

How Is the Trade Union Movement Prior to World War