There has been a heavy selection pressure on American unions by union busting. As a result, the few unions that remain are those that are strong politically. Sp

There has been a heavy selection pressure on American unions by union busting. As a result, the few unions that remain are those that are strong politically. Specifically, those that manage to cling to power in the face of adversity, and resist outside pressures. Those features help labor relations when things are strained. But it involves very harsh dog fighting that tends to leave both sides wounded.