Facebook group of friends - visible - why???

Hey. I wanted to post something and show it only to certain people, so i made a list of people, added them to a group and named somehow, then - after I added something to facebook I restricted privacy so that these people seen those pictures i published for e.g - BUT: the thing is that these people see each other as they click on that wheel of privacy which is placed under the album. They can see who's on the list. I don't like it, can i SOMEHOW hide their names so they didn't see who's on the list?

Please: if you don't know the answer: DO NOT ANSWER AT all, i think i wrote clearly about that issue of mine. Thanks