Contractors and subcontractors must pay mechanics and laborers on the site at least the local prevailing wage including fringe benefits. This protects local workers from being underpaid to reduce a contract bid.
Organized labor is responsible for safety in the workplace. Companies cut corners and make sacrifices to increase profits. With public companies, the duty to shareholders requires profit to be a priority. Labor law requirements allow management to treat workers properly.
Thank you , organized labor, for weekends.