What does Martin Luther King mean by brotherhood and Sisterhood?

King expresses a similar belief in his speeches, emphasizing the brotherhood of white and black men and urging people of different races to treat each other with compassion. In “I’ve Been to the Mountaintop,” he tells his audience that “either we go up together or we go down together,” using the unity of man to explain why one’s freedom is tied to the freedom of others. Similarly, he closes “I Have a Dream” with an image that parallels Paul’s letter, describing “black men and white men, Jews and Gentiles, Protestants and Catholics” joining hands in solidarity. In a powerful expression of compassion in “Mountaintop,” King describes the men who threaten to murder him as “our sick white brothers,” insisting on classifying even his enemies as members of the brotherhood. He expresses a similar sentiment in “Selma” when he speaks of the coming era as the “day not of white men, not of black men, but of man as man.” As sister hood, i never heard much about. If this helped your welcome, if not im sorry...

Explanation:

i'm not sure i'm so sorry i will see what i can do