Your search Henry I. Siegel Co., Inc., Petitioner, v. National Labor Relations Board, Respondent, Andamalgamated Clothing Workers of America, Afl-cio, Intervenor.amalgamated Clothing Workers of America, Afl-cio, Petitioner, v. National Labor Relations Board, Respondent, Andhenry I. Siegel Co., Inc., Intervenor did not match any document.