Final answer:
The question asks about McNeil's later life contributions to equality, but McNeil is not described in the provided information. Leaders like W.E.B. Du Bois, Martin Luther King Jr., and John Lewis, and organizations such as the NAACP and the SCLC are highlighted for their activism.
Step-by-step explanation:
The individual referred to as McNeil in the context of the civil rights movement and fighting for equality is not clearly defined in the provided information. The provided text gives extensive insight into leaders like W.E.B. Du Bois, Martin Luther King Jr., and John Lewis, as well as organizations like the NAACP and the SCLC. These individuals and entities engaged in various forms of activism such as writing, organizing marches, and advocating for legal and educational reforms. Du Bois emphasized education and leadership within the African-American community, while the NAACP fought legal battles for civil rights. Meanwhile, King and the SCLC organized nonviolent protests such as sit-ins and the famous March on Washington. Therefore, without a specific reference to McNeil and his actions later in life, it is impossible to accurately select an answer from the given options.