Tens of thousands of workers in the Los Angeles Unified School District are participating in a three-day strike over stalled contract talks, led by members of Service Employees International Union Local 99. The strike, which began Tuesday morning, has caused all schools in the district to be closed and is demanding better wages and increased staffing. The union is hoping that the strike will put pressure on the district to reach a resolution that meets the needs of its members, though it is unclear when an agreement will be reached.