A group of Microsoft Corp. employees has voted to form the software company’s first labor union in the U.S., marking the latest example of workers from top tech companies organizing in recent years.The group comprises about 300 quality-assurance testers in Microsoft’s ZeniMax unit, the Communications Workers of America, which is representing it, said on Tuesday.Just a handful of U.S.-based unions exist in the videogame industry.Continue reading your article witha WSJ membershipa WSJ membershipAlready a member?Sign In- Michael Kors:Sign Up For KORSVIP + Get 10% off your First Purchase w/ Michael Kors promo code- JCPenney:Today's JCPenney coupon code - 30% off entire purchase- Target:Get 20% Off with online Target promo code- T.J. Maxx:Get Free delivery when you sign up for emails - TJ Maxx Code- Best Buy:Avail $400 discount on select gaming laptops- Macy's:Macy's coupon - Sign up to get 25% off next order"