Why are labor unions able to negotiate effectively with companies where individual workers can’t?

Why are labor unions able to negotiate effectively with companies where individual workers can't? Labor unions can use the power of collective bargaining and strikes to make management listen. Instead of using the power of one, easily replaced worker, the union uses the power of all workers for leverage.

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this forms a narrow, steep sided inlet (sometimes deeper than 1300 metres) connected to the sea. the terminal moraine pushed down the valley by the glacier is left underwater at the fjord’s entrance, causing the water at the neck of the fjord to be shallower than the main body of the fjord behind it.