Midwest Piping Rule Law and Legal Definition

Midwest piping rule is a principle of labor law that an employer may not recognize multiple unions during a period in which there are conflicting claims of representation. The standard was set in the case Midwest Piping & Supply Co., 63 N.L.R.B. 1060 (N.L.R.B. 1945).

The following is an example of a caselaw on Midwest Piping rule:

Midwest Piping rule prohibits an employer from recognizing or executing a collective bargaining agreement with one of two or more competing unions at a time when their conflicting claims raise a question concerning representation. [NLRB v. Newport Div. of Wintex Knitting Mills, Inc., 610 F.2d 430, 431 (6th Cir. 1979)]