Between 1890 and 1932, a legal view emerged that unions: were illegal because they interfere with free trade. were unconstitutional because they violate first amendment rights. were legitimate but should be controlled by legal regulation to make sure they are serving the public interest. were necessary to a free, democratic society.

C. Were legitimate but should be controlled by legal regulation to make sure they are serving the public interest

Explanation:

The Labor Unions emerged in the US around the 1790s, first, they were not accepted by the government and the employers. They were considered restraint of trade and a conspiracy.

With time the Unions got more organized and started to play a pivotal role in political elections. With that people started to respect the Unions more and legislation started to emerge. The Clayton Act determined that the Unions were not illegal, were not a restraint of trade and a conspiracy.

It was around 1918 that more modern labor legislation emerged. The War Labor Conference Board was created to mediate labor disputes that affected industries essential to the war.

Later, in 1926 the Congress passed the Railway Labor Act that established that the National Mediation Board was responsible for mediating disputes of labor.

In 1932 the Norris-La Guardia Act was passed, it forbids federal courts from temporarily or permanently enjoining union activities like peaceful picketing and strikes.

honestly i really it keep confusion down on some sides