In fact, it is the corporations that dictate the conditions of their workers. Corporations squeeze their contractors into paying sub-minimum wages. Large retailers and retail chains pressure contract manufacturers by refusing to pay more that a rock-bottom price for manufacturing orders. They also demand that their manufacturing contractors guarantee them a profit by buying back unsold merchandise at the end of each season. Manufacturers deal with this financial squeeze not by cutting their own profits, but by cutting workers' wages and benefits, and by compromising workers1 physical safety.
Many corporations also refuse to contract to union shops.
In the end, it is the workers who pay for corporate greed. Unfortunately the Department of Labor does not have enough personnel to inspect every workplace for labor violations. The Department of Labor only requires companies to have an internal monitoring policy, as opposed to an external monitoring policy where site inspections and evaluations would be unannounced and conducted by impartial parties. With internal monitoring there is no way to know whether companies are telling the truth about the conditions in their own factories. Even when companies are caught violating workers' rights, the punishment is often nominal.