U.S. civil rights campaigner Dr. Martin Luther King Jr. writes his open letter from Birmingham Jail, sometimes known as "The Negro Is Your Brother", while incarcerated in Birmingham, Alabama, for protesting against segregation.

Martin Luther King Jr. was an American Baptist minister, civil rights activist and political philosopher who was a leader of the civil rights movement from 1955 until his assassination in 1968. He advanced civil rights for people of color in the United States through the use of nonviolent resistance and civil disobedience against Jim Crow laws and other forms of legalized discrimination.

The "Letter from Birmingham Jail", also known as the "Letter from Birmingham City Jail" and "The Negro Is Your Brother", is an open letter written on April 16, 1963, by Martin Luther King Jr. It says that people have a moral responsibility to break unjust laws and to take direct action rather than waiting potentially forever for justice to come through the courts. Responding to being referred to as an "outsider", King writes: "Injustice anywhere is a threat to justice everywhere."

Birmingham is a city in the north central region of Alabama, United States. It is the second-most populous city in the state with a population of 200,733 at the 2020 census and estimated at 196,357 in 2024, while the Birmingham metropolitan area with over 1.19 million residents is the largest metropolitan area in Alabama and 47th-most populous in the US. Birmingham serves as a major regional economic, medical, and educational hub of the Deep South, Piedmont, and Appalachian regions. It is the county seat of Jefferson County.

April 16 is the 106th day of the year in the Gregorian calendar; 259 days remain until the end of the year.