Key Leader of the March on Washington

The Civil Rights Movement of the 1950s and 1960s saw the involvement of various organizations and leaders who played crucial roles in advocating for African American civil rights. One significant event during this period was the March on Washington for Jobs and Freedom in 1963, where many African Americans and allies gathered to demand economic and racial justice.

Which of the following leaders is most famously associated with the March on Washington, where he delivered his iconic 'I Have a Dream' speech?