"After Abel's death, LDS Church president Joseph F. Smith on multiple occasions declared Abel's ordination to the priesthood as "null and void by [Joseph Smith] himself because of his blackness", suggesting based on Coltrin's previous testimony that Joseph Smith before his death had indeed repented of his initial decision that Abel receive the priesthood. Scarcely a few years had passed since Joseph F. Smith had himself been the one to ordain Abel and to set him apart to serve his final church mission. Apostle Joseph Fielding Smith, who later became president of the church, went so far as to suggest that there had been two Elijah Abels – one white and one black." - Elijah Abel, Disputes over priesthood, Posthumous commentary on Abel's priesthood, Wikipedia.org | wasmormon.org
"After Abel's death, LDS Church president Joseph F. Smith on multiple occasions declared Abel's ordination to the priesthood as "null and void by [Joseph Smith] himself because of his blackness", suggesting based on Coltrin's previous testimony that Joseph Smith before his death had indeed repented of his initial decision that Abel receive the priesthood. Scarcely a few years had passed since Joseph F. Smith had himself been the one to ordain Abel and to set him apart to serve his final church mission. Apostle Joseph Fielding Smith, who later became president of the church, went so far as to suggest that there had been two Elijah Abels – one white and one black." - Elijah Abel, Disputes over priesthood, Posthumous commentary on Abel's priesthood, Wikipedia.org

1969 Official First Presidency Statement on the Doctrines of Banning Blacks from the Priesthood

Just as the statement from the First Presidency in 1949, there was another statement issued in 1969 regarding the stance of the church on denying the priesthood to any black member of the church. In 1949, the First Presidency consisted of George Albert Smith, J Reuben Clark & David O McKay. In 1969, the presidency …

"From the beginning of this dispensation, Joseph Smith and all succeeding presidents of the Church have taught that Negroes, while spirit children of a common Father, and the progeny of our earthly parents Adam and Eve, were not yet to receive the priesthood, for reasons which we believe are known to God, but which He has not made fully known to man." - Statement of the LDS First Presidency David O McKay, Hugh B Brown, and N Eldon Tanner, December 15, 1969, regarding the position of the church with regard to the Negro. | wasmormon.org
"Joseph Smith and all succeeding presidents of the Church have taught that Negroes, while spirit children of a common Father, and the progeny of our earthly parents Adam and Eve, were not yet to receive the priesthood, for reasons which we believe are known to God, but which He has not made fully known to man." - Statement of the LDS First Presidency David O McKay, Hugh B Brown, and N Eldon Tanner, December 15, 1969, regarding the position of the church with regard to the Negro.
"The position of the Church of Jesus Christ of Latter-day Saints affecting those of the Negro race who choose to join the Church falls wholly within the category of religion. It has no bearing upon matters of civil rights. In no case or degree does it deny to the Negro his full privileges as a citizen of the nation. This position has no relevancy whatever to those who do not wish to join the Church. Those individuals, we suppose, do not believe in the divine origin and nature of the church, nor that we have the priesthood of God. Therefore, if they feel we have no priesthood, they should have no concern with any aspect of our theology on priesthood so long as that theology does not deny any man his Constitutional privileges." - Statement of the LDS First Presidency David O McKay, Hugh B Brown, and N Eldon Tanner, December 15, 1969, regarding the position of the church with regard to the Negro. | wasmormon.org
"The position of the Church of Jesus Christ of Latter-day Saints affecting those of the Negro race who choose to join the Church falls wholly within the category of religion. It has no bearing upon matters of civil rights. In no case or degree does it deny to the Negro his full privileges as a citizen of the nation. This position has no relevancy whatever to those who do not wish to join the Church. Those individuals, we suppose, do not believe in the divine origin and nature of the church, nor that we have the priesthood of God. Therefore, if they feel we have no priesthood, they should have no concern with any aspect of our theology on priesthood so long as that theology does not deny any man his Constitutional privileges." - Statement of the LDS First Presidency David O McKay, Hugh B Brown, and N Eldon Tanner, December 15, 1969, regarding the position of the church with regard to the Negro.
"We are eager to share with men of all races the blessings of the Gospel. We have no racially-segregated congregations. Were we the leaders of an enterprise created by ourselves and operated only according to our own earthly wisdom, it would be a simple thing to act according to popular will. But we believe that this work is directed by God and that the conferring of the priesthood must await His revelation." - Statement of the LDS First Presidency David O McKay, Hugh B Brown, and N Eldon Tanner, December 15, 1969, regarding the position of the church with regard to the Negro. | wasmormon.org
"We are eager to share with men of all races the blessings of the Gospel. We have no racially-segregated congregations. Were we the leaders of an enterprise created by ourselves and operated only according to our own earthly wisdom, it would be a simple thing to act according to popular will. But we believe that this work is directed by God and that the conferring of the priesthood must await His revelation." - Statement of the LDS First Presidency David O McKay, Hugh B Brown, and N Eldon Tanner, December 15, 1969, regarding the position of the church with regard to the Negro.

Byron Marchant, Accused Dissident, Unjustifiably Excommunicated for Opposing Priesthood Ban in 1977

Among the first votes of dissent in the modern Mormon church occurred in 1977, in opposition to the church doctrine banning blacks from any priesthood ordination and temple endowment. A member voted opposed to sustaining church leadership in General Conference 1977 and was subsequently excommunicated. Then less than 1 year later the church downgraded the …