Supreme Court of the United States March 25, 1957, 50 (San Diego Building Trades Council v. Garmon)

Mr. Chief Justice Warren

delivered the opinion of the Court.

Respondents are a partnership, operating two retail lumber yards in San Diego County, California. In the year before this proceeding began they purchased more than $250,000 worth of material from outside of California for resale at retail. Petitioner unions asked them to sign a contract including a union shop provision.