Arpaio has been accused of numerous types of police misconduct, including abuse of power, misuse of funds, failure to investigate sex crimes, criminal negligence, abuse of suspects in custody, improper clearance of cases, unlawful enforcement of immigration laws, and election law violations. A Federal court monitor was appointed to oversee his office's operations because of complaints of racial profiling. The U.S. Department of Justice concluded that Arpaio oversaw the worst pattern of racial profiling in U.S. history, and subsequently filed suit against him for unlawful discriminatory police conduct. Arpaio and the MCSO were named as defendants in dozens of civil lawsuits brought by citizens arrested by Arpaio and his deputies alleging wrongful arrest, wrongful death, entrapment and other claims, costing taxpayers in Maricopa County over $140 million in litigation against Arpaio during his tenure as sheriff.