1961-1975 aerospace africanamericanlaborunionmembers africanamericanmembership africanamericans andagriculturalimplementworkersofamerica automobileindustryandtrade automobileindustryworkers canada caw-canada collectivebargaining detroit economicconditions employment industrialrelations laborunions laborunionsandinternationalrelations management michigan publicopinion unitedautomobile unitedstates vietnamwar