NBC is reporting a shake-up inside the Democratic National Committee has ousted some longtime officials over their opposition to DNC Chair Tom Perez. The shake-up is part of an ongoing struggle between the insurgent progressive wing of the DNC, fueled by Vermont Senator Bernie Sanders, and the DNC’s more centrist wing, which Perez represents. Among those ousted was James Zogby, head of the Arab American Institute and prominent Sanders supporter, and Barbra Casbar Siperstein, the first transgender member of the DNC.