 Equal protection may have seemed inapt to the litigants or to the Court for a case of sex discrimination in 1942 , or it may have seemed inapt for a case of cross @-@ group challenge . The Sixth Amendment was not again invoked by the Supreme Court against jury discrimination for thirty years ; the Sixth Amendment did not ( yet ) apply to state juries , and in federal cases the Court seemed to prefer its supervisory power over lower federal courts . 
