United States Can Company v. National Labor Relations Board, United Steelworkers of America, Afl-Cio-Clc, Intervening

EASTERBROOK, Circuit Judge.

Inter-American Packaging, Incorporated, is in the container business. One of its subsidiaries, United States Can Company, operated five packaging plants scattered throughout the United States when, in 1987, it acquired four additional plants from the “general packaging” division of Continental Can Company. Continental had a master agreement with the United Steelworkers of America, which represented many of its employees — and also represented the workers at U.S. Can’s plants. Continental’s master agreement, effective until February 1989, called for multi-plant…