(1880 - 1969) powerful labor leader in the United States from 1917 to 1960. Formerly president of the United Mine Workers, a labor movement to improve conditions for mine workers. Throughout World War II Lewis repeatedly called his minersout on strike, defying the government in many instances. In December 1946 a Federalcourtinjunction was issued against the United Mine Workers, enjoining them to stop striking and levying fines of $3,500,000 against the group and $10,000 against Lewis personally. —How To Live Though an Executive. Final approval 31.10.89