NFWA AMFA GSOC UNICCO union LoPizzo CUOE shearers unionized scabbing strikebreakers hunger Purifers bargaining IQpAQpTQpSQpE wildcat Paperworkers switchmen shirtwaist Mavial NLRA Rieve mineworkers Teamsters sitdown Litening NATCA Noordermarkt steelworkers IATSE UTW strikers Sitdown WGAE lockout dockers photoengravers