Four former Google workers will file a federal complaint against the company for unfair labor practices, alleging they were fired last week for trying to organize a union.

Google fired the four employees last week for violating its policies on data security, Bloomberg News reported.

“We spoke up when we saw Google making unethical business decisions that create a workplace that is harmful to us and our colleagues,” the workers — Laurence Berland, Paul Duke, Rebecca Rivers and Sophie Waldman — wrote in a Medium blog post on Tuesday. “We participated in legally protected labor organizing, fighting to improve workplace conditions for all Google workers. Last week, Google fired us for engaging in protected labor organizing.”

The workers’ stated their actions included “demanding Google improve its treatment of our temp, vendor, and contractor colleagues (‘TVCs’)” and supporting TVC colleagues in Pittsburgh through the process of successfully forming a union earlier this year.

In a statement provided to TechCrunch, a Google spokesperson said, “We dismissed four individuals who were engaged in intentional and often repeated violations of our longstanding data security policies, including systematically accessing and disseminating other employees’ materials and work. No one has been dismissed for raising concerns or debating the company’s activities.”