(Taken from Wikipedia)

Industrial Unionism is a labor union organizing method through which all workers in the same industry are organized into the same union -- regardless of skill or trade -- thus giving workers in one industry, or in all industries, more leverage in bargaining and in strike situations. Advocates of industrial unionism value its contributions to building unity and solidarity, suggesting the slogans, "an injury to one an injury to all" and "the longer the picket line, the shorter the strike." Industrial unionism contrasts with craft unionism, which organizes workers along lines of their specific trades, even if leads to multiple union locals (with different contracts) in the same workplace.