From 1880 to around 1930, a key weapon against unionization was the injunction or a court order to "cease and desist" activities deemed to be potentially harmful to others.

Injunction

A judicial order that requires a party to do or to refrain from doing specific acts, used to prevent harm or to maintain the status quo during litigation.

Unionization

is the process by which workers form or join a union to collectively negotiate with their employers regarding wages, working conditions, and other employment related matter.

Court Order

A legal directive issued by a court requiring a party to do or refrain from doing specific acts.