What law has Companies that have 50 workers or more had to allow their workers up to 12 days of leave in order to take care of family issues?

The law you're referring to is the Family and Medical Leave Act (FMLA), enacted in the United States in 1993. It requires employers with 50 or more employees to provide eligible workers with up to 12 weeks of unpaid leave per year for specific family and medical reasons, including caring for a newborn, adopting a child, or addressing serious health conditions. This law ensures job protection during the leave period, allowing employees to manage family responsibilities without fear of losing their jobs.