sentences:  Roberts has drawn parallels between what she sees as current U.S. "imperialism" and white supremacy.She has asserted that U.S. torture of terrorist suspects is a tool to maintain supremacy just as violence has been used to maintain white supremacy, and has compared the treatment of prisoners at Abu Ghraib prison to racist lynchings of blacks.Throughout the years, Roberts has explored topics such as race, reproduction, and motherhood in her scholarship.