Martin Luther King Jr. came to Dexter Avenue Baptist Church as a non-controversial hire for pastor in a church with internal issues. His pastoral work led him to his civil rights work. Rosa Parks was arrested a year after his arrival in Montgomery.
King began speaking out and leading peaceful protests. From the church, he helped ignite the Montgomery bus boycott. According to Baldwin, King saw this as a natural extension of pastoring his people.
The 2006 video linked below shows the church and has interviews with members who describe King's impact on them. The PBS video contains a transcript.