sentences:  He was a close associate of UBCJ president William Hutcheson.In 1903, Duffy was elected a vice-president of the nascent Structural Building Trades Alliance, a federation of building and construction trades unions.When the International Union of Bricklayers and Allied Craftworkers refused to join the Alliance, preventing Bricklayer president George P. Gubbins from assuming his duties as Alliance president, Duffy assumed the duties of president for a year until a new president was elected.