“Segregation is wrong because it is a system of adultery perpetuated by an illicit intercourse between injustice and immorality.”

1960s, Keep Moving From This Mountain (1965)
Context: And now it is time for us to move on to that great and noble realm of justice and brotherhood. That is the great struggle taking place in our nation today. It isn’t a struggle just based on a lot of noise; it is a struggle to save the soul of our nation for no nation can rise to its full moral maturity so long as it subjects a segment of its citizenry on the basis of race or color. And somehow we must come to see more than ever before that racial injustice is a cancer in the body politic which must be removed before our moral health can be realized. Racial segregation must be seen for what it is — and that is an evil system, a new form of slavery covered up with certain niceties of complexity. [... ] Segregation is evil because it relegates persons to the status of things. [... ] And segregation is evil because it stigmatizes the segregated as an untouchable in a caste system. We’ve been in the mountain of segregation long enough and it is time for all men of goodwill to say now, “We are through with segregation now, henceforth, and forever more.”

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 427.

Leader of the Liberal Party in the House of Commons
Source: Speech to the Welsh National Liberal Federation in Rhyl (9 July 1926), quoted in The Times (10 July 1926), p. 16

Sexuality, Pornography, and Method: "Pleasure under Patriarchy" (1989) Ethics, Vol. 99, No. 2 pp. 314-346

quoted in "Internal Exile" by Pankaj Mishra in The New Yorker, 2022

From Her Books, I Have Chosen To Stay And Fight, RACISM AND CIVIL RIGHTS

"Summary of Principles" 2.7
Enquiry Concerning Political Justice (1793)
Variant: Government was intended to suppress injustice, but it offers new occasions and temptations for the commission of it.

Generally attributed to Nietzsche, this is a quotation from Curtis Cate's Friedrich Nietzsche: A Biography (2003) and is the author's interpretation of Nietzsche's Aphorism 221 (Beyond Good and Evil)
Misattributed

Noam Chomsky interviewed by Zeit Campus;
Quotes 2010s, 2011
Context: [ZEIT Campus: Political engagement like yours is rare among scholars. Are you sometimes furious at the “servants of power” as you say or at professor colleagues who only concentrate on their academic work? ] Chomsky: I consider it immoral to be a supporter of a power system. However that does not mean that I am furious at anyone. Scholars per se do not have deeper political insights than other persons and are not morally superior to others. But they are obligated to help politicians seek and find the truth.