How was in re debs a significant case for labor unions in the US?

In In re Debs (1895), the Supreme Court upheld the federal government's authority to issue injunctions against labor strikes, which significantly impacted labor unions in the U.S. The case arose from the Pullman Strike, where the Court ruled that the strike obstructed mail delivery and violated federal law. This decision set a precedent that allowed the government to intervene in labor disputes, thereby limiting the power of unions and encouraging the use of injunctions to suppress strikes. As a result, it marked a critical moment in the struggle between labor rights and government authority, shaping the future of labor relations in America.