Albert Einstein gave a lecture on relativity in 1946 after the war and before the civil rights movement. His peers criticized this appearance. The press purposefully did not cover it. He wanted to inspire young minds with the beauty and power of science. (Paraphrased from an unknown original author.)
The following is an article on the subject: https://news.harvard.edu/gazette/story/2007/04/albert-einstein-civil-rights-activist/.