The modern American origins of contemporary black liberation theology can be traced to July 31, 1966, when an ad hoc group of 51 black pastors, calling themselves the National Committee of Negro Churchmen (NCNC), bought a full page ad in the New York Times to publish their "Black Power Statement," which proposed a more aggressive approach to combating racism using the Bible for inspiration.
James Cone and Dwight Hopkins are considered the leading theologians of this system of belief, although now there are may scholars who have contributed a great deal to the field. It was Cone who in the spring of 1969 published the seminal work that systemized black liberation theology, Black Theology and Black Power (1969). In the book, Cone asserted that not only was black power not alien to the Gospel, it was, in fact, the Gospel message for all of 20th century America.
And here are the founder's words on "black liberation theology":
"Black theology refuses to accept a God who is not identified totally with the goals of the black community. If God is not for us and against white people, then he is a murderer and we had better kill him. The task of black theology is to kill all gods who do not belong to the black community. Black theology will accept only the love of God which participates in the destruction of the white enemy. What we need is the divine love as expressed in black power which is the power of black people to destroy their oppressors here and now by any means at their disposal. Unless God is participating in this holy activity, we must reject his love." -- James Cone