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A group of workers at Raven Software, a studio owned by Activision Blizzard, said Friday that they were forming a union and wanted the prominent video game company to voluntarily recognize it.

The newly formed union, the Game Workers Alliance, says it includes more than 80 percent of the 34 people in the quality assurance division of Raven, the Wisconsin studio that helps create Activision’s popular Call of Duty game. More than 60 Raven employees walked out in early December, protesting the company ending the contracts of a dozen temporary Raven quality assurance workers, which they said felt abrupt and unfair.

“This is just the best thing for us and our company going forward, for us to have a voice,” said Erin Hall, a Raven quality assurance worker who helped organize…