nine o'clock at night
In 1905 A.D. , labor succeeded in getting a law passed in Pennsylvania providing that proof of the age of the child and of certain educational qualifications must accompany the oath of the parent . This was promptly declared unconstitutional by the Luzerne County Court , on the ground that it violated the Fourteenth Amendment in that it discriminated between individuals of the same class -- namely , children above fourteen years of age and children below . The state court sustained the decision . The New York Court of Special Sessions , in 1905 A.D. , declared unconstitutional the law prohibiting minors and women from working in factories after nine o'clock at night , the ground taken being that such a law was `` class legislation . '' Again , the bakers of that time were terribly overworked . The New York Legislature passed a law restricting work in bakeries to ten hours a day . In 1906 A.D. , the Supreme Court of the United States declared this law to be unconstitutional .