Patrick Henry McCarthy (March 17, 1863 – July 1, 1933), generally known as P. H. McCarthy and sometimes, more jocularly, as "Pinhead", was an influential labor leader in San Francisco and the 29th Mayor of the City from 1910 to 1912. Born in County Limerick, Ireland, he apprenticed as a carpenter in Ireland before emigrating to the United States in 1880. He moved to San Francisco in 1886, where he rose through the ranks to become president of Carpenters Local 22, then President of the Building Trades Council in 1896. He was one the founder of the Japanese and Korean Exclusion League that 2 years later renamed into the Asiatic Exclusion League. Leadership in the Building Trades Council The San Francisco Building Trades Council was one of the most powerful local labor bodies within the American Federation of Labor at the time. It fought off the efforts of employers in San Francisco to impose the open shop on construction workers in the first decade of the twentieth century and was active in local politics. It also feuded with the San Francisco Labor Council, the body that claimed to represent all of organized labor in San Francisco. The BTC barred its members from belonging to the SFLC and often refused to support SFLC activities; it did not support the Teamsters and longshore workers in the City Front Federation strike of 1901, preferring to maintain its dominant position in the construction industry than join in a direct confrontation with the most powerful businesses of the region. Within its own sphere the BTC was highly effective, coordinating the efforts of roughly fifty unions to police every construction worksite in the City to check that only union members were working there. The BTC was able to turn this control at the workplace level into better wages in the San Francisco construction industry than anywhere else in the country in the first decades of the twentieth century. The BTC was able to do this, moreover, without fighting the drawn-out battles that unions elsewhere had to wage simply to obtain recognition or preserve their rights: only two building trades strikes in San Francisco between 1901 and 1921 lasted more than a week. The exception to that rule came in 1900, when the BTC unilaterally declared that its members would work only eight hours a day for $3 a day. When mill resisted, the BTC began organizing