 In 2010, the Caucus of Rank and File Educators (CORE), led by President Karen Lewis gained control over the CTU by winning 60% of the vote in a run-off election.CORE ran an aggressive grassroots organizing campaign, and took a strong stance against school privatization.CORE accused the incumbent United Progressive Caucus (UPC) of capitulating to corporate interests, silencing dissent within the union, and collaborating with the city to prevent union outreach at schools.