Officials have asked Gov. Maura Healey to send in the Massachusetts National Guard to stop violence and address security concerns at a troubled high school in a city south of Boston, some school committee members said Monday. Four of the seven members of the Brockton School Committee backed the National Guard request amid teacher shortages and budget deficits, but city officials weren't unanimous in their support. The governor's office acknowledged the concerns about Brockton High School, where teachers reported fighting and drug use in the hallways, and verbal abuse of staff. “Our administration is committed to ensuring that schools are...