The Department of Homeland Security (DHS) announced on Thursday that it will close two migrant detention centers, both of which face allegations of abuse. Secretary of Homeland Security Alejandro Mayorkas ordered Immigration and Customs Enforcement (ICE) to stop using the C. Carlos Carreiro Immigration Detention Center in North Dartmouth, Massachusetts. In a report (pdf) released in December last year, the Massachusetts attorney general determined “that a series of institutional failures and poor decisions” by the Bristol County Sheriff’s Office leadership led to “disproportionate” use of force against the detainees at the center. “Allow me to state one foundational principle: we will not tolerate the mistreatment of individuals in civil immigration detention or substandard conditions of detention,” Mayorkas wrote in a memo to ICE Acting Director Tae Johnson. “DHS detention facilities and the treatment of individuals in those facilities will be held to our health and safety standards.  Where we discover they fall short, we will continue …