Closing part of a business is an unfair labor practice under § 8(a)(3) of the Act if the purpose is to discourage unionism in any of the employer's remaining plants and if the employer may reasonably have foreseen such effect.

If those exercising control over a plant that is being closed for anti-union reasons have an interest in another business, whether or not affiliated with or in the same line of commerce as the closed plant, of sufficient substantiality to promise a benefit from nonunionization of that business, act to close their plant for that purpose, and have a relationship to the other business which makes it probable that its employees will fear closing down if organizational activities are continued, an unfair labor practice has been made out.

Since no findings were made by the Board as to the purpose and effect of the Darlington closing with respect to the employees of the other plants in the Deering Milliken group, the judgments are vacated and the cases remanded to permit such findings to be made.

Associate Justice John M. Harlan II authored the opinion of the Court.

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