Karl Marx described trade unions thus: "The value of labour-power constitutes the conscious and explicit foundation of the trade unions, whose importance for the working class can scarcely be overestimated.
”卡尔·马克思将工会描绘为：“...劳动力价值构成工会清晰而明确的基础为，对于工人阶级来说其重要性从未被高估。