Prosecutors have moved to dismiss its case against the SEIU West president.
Joe Biden, Elizabeth Warren and other Democratic frontrunners converged on Los Angeles Friday to try to win the support of the SEIU.
Hundreds of local workers marched near LAX, calling on elected officials to support unionization. The large demonstration snarled traffic in the area on Wednesday.
The Los Angeles Unified School District has reached a tentative contract agreement and averted a strike by the union that represents thousands of custodians and other service workers.