Joachim Prinz

Joachim Prinz (May 10, 1902 – September 30, 1988) was a German-American rabbi who was an outspoken activist against Nazism in Germany in the 1930s and later became a leader in the civil rights movement in the United States in the 1960s. As a young rabbi in Berlin, he urged Jews in Germany to leave the country amidst the rise of the Nazi Party. The Nazi government expelled Prinz in 1937, and he settled in the United States. In his adopted country, he continued his advocacy for European Jews as a leader in the World Zionist Organization. He saw common cause between the fight against Nazism with the drive for civil rights in America and was one of the founding chairmen of the 1963 March on Washington. During the program, Prinz spoke immediately before Martin Luther King Jr. delivered his iconic "I Have a Dream speech".

https://en.wikipedia.org/wiki/Joachim_Prinz