The Boston protest was one of many across the country in support of David Huerta, president of the California SEIU, who was detained by federal officials in Los Angeles on Friday.

Trump's escalation of immigration arrests by shifting into workplaces ignited clashes between protesters and officers in the immigrant-heavy city.

The military has activated about 700 active-duty Marines who could be sent to Los Angeles, joining National Guard troops who were sent to the city to respond to protests, U.S. Northern Command said in a statement.