But first it will try to answer two questions: how did public-sector unions become so powerful?

不过首先要试着回答两个问题：他们是如何变得如此强大的？

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And Obama got the support of some powerful labor unions, which meant their members were likely to vote for him.

同时，奥巴马也得到了一些强有力的劳工组织的支持，这意味着他们的组织成员很有可能投奥巴马的票。

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The once-powerful post unions have been cut down to size.

一度很强势的邮政联盟已经威风不不再。

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Other powerful unions in Democratic politics are part of the effort including the Retail, Wholesale and Department Store Union.

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Most protectionism in America is the result of organized interest groups and powerful unions trying to prop up inefficient practices.

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South Korea President Kim Dae Jung is taking care with industrial restructuring rather than confronting powerful unions opposed to mass layoffs.

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