"The case was one of the first clear-cut defeats for the Board before the Supreme Court, after an unprecedented string of 15 successes.Along with "NLRB v. Fansteel Metallurgical Corp.", 306 U.S. 240 (1939) and "NLRB v. Sands Manufacturing Co.", 306 U.S. 332 (1939), the decision has been called one of the three most significant NLRB cases since "NLRB v. Jones & Laughlin Steel Corporation", 301 U.S. 1 (1938) upheld the NLRA's constitutionality.