What did a quarter million construction workers reach their lifetime limits on
Some of these early unions also came out of a guild tradition , in which skilled workmen often owned their own shops or , if they worked for another , had a good deal of control over how the work was done , which they policed by maintaining standards for admission into the trade , requiring entrants to go through an apprenticeship program controlled by the union , rather than the employer , and dictating the processes , tools , standards and pace of work .