Around 600 quality assurance (QA) workers employed by Activision under Microsoft Corp. (NASDAQ: MSFT) have successfully formed a union named Activision Quality Assurance United (AQAU) with the support of the Communications Workers of America (CWA). This marks the first unionization effort within Activision since its acquisition by Microsoft and stands as the largest video game worker union in the United States, IGN reported. See Also: SEGA Workforce Shake-Up: 61 Employees Face Layoffs While There Is Union Opposition The union comprises central QA workers from Activision offices located in Texa…