ACLU of Massachusetts criticizes blow against openness.
Unanimous vote follows Somerville's ending of the practice through executive order.
Class action lawsuit argued federal government wrongly incarcerated dozens in Massachusetts jails under "mandatory detention" provision.
ACLU-backed proposal now under consideration would protect social media from snooping employers.
Property owner and politicians sued Mayor Daniel Knapik for ordering campaign signs removed just before municipal elections decided by fewer than 30 votes. Parties agree Knapik to pay $53,000 for attorneys fees.