SALISBURY — A sitting Salisbury City Council member’s tenure with the National Association for the Advancement of Colored People is under scrutiny, according to a letter obtained by the Salisbury Post that described Gemale Black’s continued NAACP membership as a “danger of irreparable harm” to the organization. Last year, Black secured a seat on Salisbury’s governing board. Prior to his election, Black served as the president for the local branc…