Joliet Con. Ass'n v. Nat'l Labor Relations Bd.

In Joliet Contractors Assn. v. Labor Board, 202 F.2d 606, cert. denied, 346 U.S. 824, the Court of Appeals for the Seventh Circuit held that a glaziers' union boycott of preglazed sashes to preserve work they had traditionally performed was an unfair labor practice under § 8(b)(4).