Martin Luther King Jr.
Just days after King's death, Congress passed the Civil Rights Act of 1968.  Title VIII of the Act, usually called the Fair Housing Act, made it illegal to discriminate in housing because of a person's race, religion, or home country.  (For example, this made it illegal for a realtor to refuse to let a black family buy a house in a white neighborhood.)  This law was seen as a tribute to King's last few years of work fighting housing discrimination in the United States.