Photo: Birthday of Martin Luther King, Jr.

The Birthday of Martin Luther King, Jr. is a federal holiday marking the birthday of Martin Luther King Jr. It is observed on the third Monday of January.

King was the chief spokesperson for nonviolent activism in the Civil Rights Movement, which successfully protested racial discrimination in federal and state law. The campaign for a federal holiday in King’s honor began soon after his assassination in 1968. President Reagan signed the holiday into law in 1983, and it was first observed three years later. It was officially observed in all 50 states for the first time in 2000.

What’s opened/closed on Monday:

Town and state offices: Closed

Trash pickup: Monday pickups are delayed by one day.

Registry of Motor Vehicles: Closed.

Federal offices: Closed.

Banks: Closed, but individual branches in other retail operations, such as supermarkets, may be open.

Post offices: Closed; no regular mail delivery.

Retailers: Open

Liquor Stores: Open

MBTA: Subways, buses and The Ride in Greater Boston will operate on a Saturday schedule. MBTA commuter rail and ferry service will run on a regular weekday schedule. Details are available at mbta.com/events.