What compelled King to write "Letter From A Birmingham Jail"?

Birmingham, Alabama was a city described by Martin Luther King Jr. as America’s most racist and worst cities. The city of Birmingham was arguably the most segregated city with unjust court treatment and record breaking brutality against the Negros. This violence included frequent bombing of Negro homes and churches. Things became so incredibly bad that the Alabama Christian Movement contacted King, the president of the Southern Christian Leadership Conference to come and engage in the necessary nonviolent action program in Birmingham. On April 10, 1963 just before King’s arrival in Birmingham the Commissioner of Public Safety, Bull Connor attained an injunction that banned all protest and increased the bail bonds for those arrested. On April 12, King and others were arrested for violating Alabama’s law against mass public protest which later becomes known as the Birmingham Campaign. During King’s imprisonment religious leaders and clergymen publicly criticize the Birmingham Campaign in a newspaper segment called “A Call to Unity”. This provoked King to respond to what became famously known as the “Letter from a Birmingham Jail.”  This letter was written to clarify the goals for his Birmingham protest as well as to inform and correct the clergymen that he was not there to cause trouble but to promote justice. Throughout this famous letter, King implemented rhetorical language to persuade the leaders of social justice to advocate their cause. Since the “Letter from a Birmingham Jail” was also publicly read, King also used it to encourage protest because he believed that men had a moral responsibility to break unjust laws in nonviolent way.