http://www.oyez.org/cases/1901-1939/1914/ U.S. Supreme Court Cases, presented by The Oyez Project (www.oyez.org) en-us <p>A Kansas law banned "yellow dog contracts." These were employer agreements barring employees from joining a labor union. Coppage, an employer, fired an employee who refused to sign such an agreement. Coppage was charged and convicted of violating the Kansas law. He appealed.</p> http://www.oyez.org/cases/1901-1939/1914/1914_48/