The number of unionized workers for Microsoft’s video game subsidiaries keeps growing, and the latest group to join the pool is the largest one yet. Approximately 600 quality assurance workers at Activision have joined the Communications Workers of America (CWA), making them the biggest certified union in the US video game industry. They’re also the first Activision workers to organize under the agreement between Microsoft and the CWA. If you’ll recall, Microsoft agreed to respect the right of Activision Blizzard workers to unionize as part of its efforts to secure regulatory approval for its $68.7 billion takeover of the video game developer.

CWA President Claude Cummings Jr. said Microsoft kept its promise to let workers decide for themselves whether they want a union. Part of Microsoft’s pledge when it agreed to make a pact with the CWA was that it would take neutral approach during a union campaign, and the company said it didn’t interfere or influence people’s votes.

Another element of their agreement was giving employees access to “innovative technology-supported and streamlined process for choosing whether to join a union,” which includes not having to petition the National Labor Relations Board for an election. In this instance, the workers only had to sign a union authorization card or to vote online. According to The New York Times, 390 workers voted in favor of forming a union, while eight people were opposed to it. Around 200 more didn’t cast their vote.

In early 2023, Microsoft also recognized a union with 300 workers for Zenimax, the owner of Bethesda and another one of the company’s video gaming subsidiaries, which was the largest one for the video game industry at the time. Those workers also unionized under the simpler process enabled by the company’s agreement with CWA. By the end of the year, Microsoft agreed to hire 77 temporary QA contractors as full-time unionized Zenimax employees, which was a welcomed win for workers in an industry beset by layoffs.