The Industrial Workers of the World's influence in Glasgow is not so well known, but it had considerable influence on the shop stewards movement in the period around the First World War:
"It was perhaps a natural development that one of the strongest branches of the Advocates of Industrial Unionism should be in the Singer Sewing Machine Works at Kilbowie, Clydebank, which employed some 12,000 workers. Singers was primarily an American firm, but it had established itself in Europe, and exerted an effective monopoly in the manufacture of sewing machines.