We have formed an organization known as the Organization of Afro-American Unity which has the same aim and objective to fight whoever gets in our way, to bring about the complete independence of people of African descent here in the Western Hemisphere, and first here in the United States, and bring about the freedom of these people by any means necessary.
That's our motto. We want freedom by any means necessary. We want justice by any means necessary. We want equality by any means necessary.

Speech at Founding Rally of the Organization of Afro-American Unity (28 June 1964) - By any means necessary: speeches, interviews, and a letter (1970)