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In page Trade union:

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Beyond the classification listed above, unions' relations with political parties vary. In many countries unions are tightly bonded, or even share leadership, with a political party intended to represent the interests of the working class. Typically, this is a left-wing, socialist, or social democratic party, but many exceptions exist, including some of the aforementioned Christian unions.[5] In the United States, trade unions are almost always aligned with the Democratic Party with a few exceptions. For example, the International Brotherhood of Teamsters has supported Republican Party candidates on a number of occasions[citation needed] and the Professional Air Traffic Controllers Organization (PATCO) endorsed Ronald Reagan in 1980.[6][7]