Employees of the Los Angeles Unified School District are poised to begin a massive three-day strike on Tuesday that would shut down the nation's second largest school district.

The Service Employees International Union Local 99, which counts 30,000 LAUSD service workers among its members, will go on strike next week, seeking improved working conditions and higher pay for its members. The union will be joined by the United Teachers of Los Angeles, forcing the school district to close for at least three days.

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“As LAUSD parents and workers, SEIU Local 99 members know a strike will be a sacrifice, but the school district has pushed workers to take this action,” Max Arias, SEIU Local 99’s executive director, said in a press release. “Families have been sacrificing for far too long on poverty wages. Students have been sacrificing for too long in school environments that are not clean, safe, or supportive for all. Too many workers have been subjected to harassment simply for demanding change. Enough is enough!”

While the striking workers looking for a better collective bargaining agreement are service workers such as bus drivers, cafeteria workers, school custodians, and special education assistants, the Los Angeles teachers union has vowed to join the picket line in "solidarity" with the striking employees.

"In a school district where 86% of students live in poverty and staff salaries aren’t nearly enough to pay rent or sometimes even put food on the table, we are proud to stand alongside the members of SEIU Local 99 as we demand an end to the hoarding of resources and call on LAUSD to make the investments today necessary to secure our success tomorrow," United Teachers Los Angeles President Cecily Myart-Cruz said.

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Los Angeles Unified School District Superintendent Alberto Carvalho has urged union members to negotiate and avoid striking, saying the protest would lead to "learning loss [and] deprivation of safety and security that schools provide to our kids."

“We believe in the right of unions and the workforce to express their opinion and take full advantage of the ability to strike," Carvalho said. "That is sacrosanct. That is an inherent right of our workforce. We also believe in understanding where our students are and considering the consequences of what we do in terms of the immediate and long-term impact on them.”