Since 1935, yes. Before the National LAbor RElations Act (Wagner Act) many unions were ruled by courts to be criminal conspiracies.
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No. Civil unions are not legal in American Samoa.
No. Civil unions are not legal under the laws of the state of Tennessee.
No. Civil unions are not legal nor recognized in the state of Nebraska.
No, the Clayton Antitrust Act exempts unions, specifically distinguishing them from trusts. Section 6 of the Clayton Act provides safe harbor for Labor unions and agricultural organizations. Therefore all peaceful forms of labor actions are not regulated by the Clayton Act. On the other side injunctions by a company is also legal to settle labor disputes.
No. Civil unions are not legal in the Northern Mariana Islands.
No. Civil unions are not legal in the US Virgin Islands.
In some places. Civil unions are legal in the states where they performed. They are also legal in other states that have legalized civil unions. Many places where same-sex marriage is legal will recognize a civil union as a legal marriage. Please see attached related question for a list of places where civil unions are legally performed.
Yes. Same-sex marriage is legal in Massachusetts and out-of-state civil unions are recognized as legal marriages.
No, civil unions and domestic partnership are not legally defined in North Dakota.
With the Trade Union Act these unions were made legal in 1871. These unions were put in place to protect employers as well as employees in the work place.
No. Civil unions are not legal in Guam, but same-sex marriage is legal in Guam effective June 9, 2015.