Martin Luther King Jr. is the civil rights leader famous for the phrase, "I have a dream." His powerful speech delivered during the 1963 March on Washington encapsulated the ideals of equality and justice. Advocating for nonviolent protest, King became a pivotal figure in the civil rights movement, fighting against racial segregation and discrimination. His commitment to social change through peaceful means inspired countless individuals and galvanized a generation toward activism. King's legacy continues to influence movements for social and racial justice, representing the ongoing struggle for human rights.