The document states that staff had no choice in the monitoring program.
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"On at least some teams, employees received no consent or acknowledgment prompt at all, and, at least initially, there was no way to opt out," the complaint alleged.
The legal challenge comes amid growing scrutiny from regulators regarding bias in algorithmic workplace tools. In response, Meta denied the allegations of algorithmic bias in its workforce reduction.
"These claims lack merit and are not based on facts," a Meta spokesperson said.
The representative emphasized that human personnel remained fully responsible for all termination decisions.
"Workforce management and organizational decisions were and are made by people, not AI," the spokesperson said.
Earlier this year, Meta CEO Mark Zuckerberg explained the purpose behind the internal monitoring tool.
"The AI models learn from watching really smart people do things," he said, defending the program as a method to train AI systems on highly skilled staff behaviors.
Attorneys representing the 26 workers called for an immediate independent probe into the automated tool selection process.
"Meta deliberately kept the mechanics of its selection process secret from its employees," the lawyers said.
The legal team argued that letting the terminations proceed would cause irreparable harm to their clients.
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"Once these separations are final, the harms are irreversible: employer-subsidized health coverage lost during pregnancy, postpartum recovery, and active medical treatment; time-bound leave rights extinguished; unvested equity forfeited; and immigration consequences triggered," the lawyers stated.