Coal Strike Threatens US Economy MS UMWA (United Mine Workers of America) President JOHN L. LEWIS posing with Secretary of the Interior JULIUS KRUG. MCU John L. Lewis. H/a LS mining town; TLS coal miners leaving mine. LSs coal mine. CU posted UMWA notice. MS/CUs women stuffing envelopes with government notice to mine workers. MS John L. Lewis leaving building wearing fedora & overcoat.