WASHINGTON—A fifth worker at a federal women’s prison in California has been charged with sexually abusing an inmate, and prosecutors say more arrests are expected at the lockup. Enrique Chavez, a food service foreman at the federal correctional institution in Dublin, California, is accused of touching an inmate’s breasts, buttocks, and genitals on two separate occasions in October 2020, according to an indictment unsealed Wednesday in federal court. Chavez was indicted on March 10, while a Bureau of Prisons task force was at Dublin speaking with inmates and staff about ways to eliminate a culture of abuse at the prison. He was arrested Sunday in Arizona and appeared in court Tuesday in Tucson. He had been on administrative leave from the prison for several months. “The government is currently investigating additional suspects for related crimes,” prosecutors said in court papers. Investigators were planning to execute multiple search warrants on Wednesday, …