This book contributes to legal and labor history by reinterpreting the U.S. Supreme Court’s Hague v. CIO (1939) decision, which upheld a federal district court injunction prohibiting Jersey City boss Frank Hague from obstructing workers from the Committee for Industrial Organization (CIO) and allies in the American Civil Liberties Union (ACLU) from meeting in urban public places. The case involved speech and assembly freedoms, rights essential for CIO workers’ organizing efforts, but, as the book shows, these rights were submerged under municipal police powers to preserve public order until the court brought them under federal protection of the Fourteenth Amendment in Hague. Revising the conventional view, the book argues that Hague was more than simply a civil liberties victory for workers over a dictatorial, antilabor city boss. Drawing on new evidence in city archives, CIO records, trial transcripts, newspaper reports, and Jersey City court filings, as well as traditional sources in ACLU records and anti-Hague literature, the book demonstrates that the Hague-versus-CIO controversy emanated more from shifts in the labor movement from craft to industrial unionism, in municipal law, in urban police practices, in the politics of anticommunism and antifascism, and especially in the Supreme Court’s “civil liberties revolution.” With women and African Americans on the periphery, the book concludes, male CIO workers initiated the case, but Hague ultimately benefitted outdoor protests more than it benefitted labor speech.