The term 'Skull and Bones Members' refers to members of the secret society known as the Order of Skull and Bones, which is based at Yale University. The answer to the crossword puzzle is ELIS, which is an acronym for the organization's full name, the 'Eulogian Club of Yale University in New Haven, Connecticut'. This secret society was founded in 1832 and has been a source of mystery and intrigue ever since. Its members are said to include some of the most influential people in the world, including presidents, business leaders, and other prominent figures.