emove barriers that have operated in the past to favor an identifiable group of white employees over other employees." 401 U.S. at 429-30; see also Albemarle Paper Co. v. Moody, 422 U.S. 405, 417-18, 95 S. Ct. 2362, 45 L. Ed. 2d 280 (1975) (stressing Title VII's prophylactic goals in addition to its purpose "to mak