直接联合在美国克莱顿法案下是非法的，但是其他国家并不如此严格。

Direct interlocks are illegal in the U. S. under the Clayton Act, but other countries are more lenient.

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谢尔曼法案第二部分于1890年通过，对“垄断、或企图垄断”判为重罪；1914年的克莱顿法补充了价格歧视和其他削弱竞争的活动。

Section Two of the Sherman act, passed in 1890, made it a felony to "monopolize, or attempt to monopolize"; 1914's Clayton act added price discrimination and other activities that reduced competition.

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