When my father was young, he was interested in something about slavery  . Later he went to work in the oilfield  at the frontier  , where he found many workers working like slaves. They had to work for more than 14 hours a day and consumed   little. Later they went on a strike and the boss wanted to solve the problem in peace . My father was appointed as the representative   to have a talk with the boss. As a result, their working conditions were improved.