my %new_member;
foreach (@newest_member) {
   $new_member{$_} = '';
}

then for your loop (which as it looks now has the wrong outer loop going):

foreach (values %whop) {
   if (exists( $new_member{$_} ) {
      print "$_<b>*</b> - ";
   }
   else {
      print "$_ - ";
   }
}