. . . . "dual unions" . . . "dual unionism" . . "separate" . . . . "dual unionist" . . "rival unionism" . "Dual Unionists" . . "Dual unionism" . "parallel unions" . "dual union" . . "dual affiliation" . . . . . . . . . "Dual unionism" . "\\\"dual\\\" labor unions" . "affiliate only with the AFT" .