Studies of mortality among metal workers funded by the United Automobile Workers (UAW) are discussed. The UAW union added an epidemiologic component to its existing occupational health and safety program three years ago. Six mortality studies supported by the UAW are summarized. An investigation of mortality among workers in a large ferrous foundry found a significant excess of deaths due to nonmalignant respiratory disease, lung cancer, and lymphopoietic cancer among white males. A significant excess of mortality from lung cancer was also found for white males who worked in the finishing departments. A significant excess of cardiovascular disease mortality was found in black males. A second study investigating mortality among white male ball bearing workers found a statistically significant excess of deaths from stomach cancer, rectal cancer, and strokes. A third study is currently investigating 2,000 deaths in another ball bearing factory. The fourth study found small proportional excesses of lymph, lung, and stomach cancer mortality in white male workers and small excesses of lung, colon, and pancreas cancer mortality in black males in automobile assembly factories. The fifth study was conducted among workers in facilities manufacturing electromechanical equipment for the aerospace industry. An earlier NIOSH study found a 3 fold excess of brain cancer deaths. The UAW study has not identified any brain cancer deaths. Both studies have found substantial excesses of pancreatic cancer and genital tumors in white females. Case control analyses are being planned. The sixth study is investigating deaths in a large group of small automobile repair shops and dealers. The main thrust of the study will be on the mortality experience of automobile repair workers potentially exposed to asbestos, gasoline exhaust, and oils and solvents.