This is what I need to achieve and have been told It is not doable:  

I have a group of Accounts (and their corresponding cases) that can only be viewed and edited (accessed) by a group of users from Different Business Units in the organization. Its a Privacy Issue). Can I use a team to allow only certain users to have access to an account?I have been reading about Access Teams but it is not clear to me whether the users that are not part of that team will still be able to access the Account. Thank you.