The Justice Department has demoted the head of its death penalty unit, after The New York Times investigated reports that he promoted favoritism, gender bias and a “sexualized environment” in the workplace. The Times cites interviews with more than a half-dozen current and former employees who say Kevin Carwile fostered a “toxic climate” rife with sexual harassment. In one alleged incident, Carwile looked on as a deputy groped an administrative assistant in view of several colleagues, and later told his employees to keep it a secret. Several employees say they complained about the abuses for years without a meaningful response.