Labor is critical to socialism and there’s one simple reason why: Power.
Ending capitalism is impossible without struggling against the capitalists. This task can feel insurmountable. But capitalism has one very important weakness: profit.
The primary driving force of the capitalist system is the desire of capitalists to generate profit, then turn that profit into even more profit. This process of accumulation is what explains the constant expansion of capital into previously untouched areas since capitalism began. Profit is never directly generated by the capitalist. Instead, they hire a workforce to produce the goods and services which they sell. A large source of the capitalist’s profit comes from workers: we are paid much less than the value we produce.