The Strategic Organizing Center (SOC), formerly known as the Change to Win Federation (CtW) is a coalition of North American labor unions originally formed in 2005 as an alternative to the AFL–CIO. The coalition is associated with strong advocacy of the organizing model. The coalition currently consists of The International Brotherhood of Teamsters (IBT); Service Employees International Union (SEIU); and United Farm Workers (UFW). Communications Workers of America (CWA) is affiliated with both the SOC and AFL–CIO. The SOC also includes SOC Investment Group, a shareholder engagement arm of the SOC that challenges management of large, publicly traded companies targeted by the SOC's campaigns. (en)