Check Identity List for specific identity

I have the following code that I have that attempts to get the list of all Identites, and then search through all of the indentities for two specific groups that I would like to deny access to, but it never finds the identity names I have that it checks for.  Anyone have any idea on how to fix this?

string[] identityList = Aras.Server.Security.Permissions.Current.IdentitiesList.Split(new []{","}, StringSplitOptions.RemoveEmptyEntries);

var identityHash = new HashSet<string>(identityList.Select(id => id.Trim(new []{'\''})));

bool accessdenied = false;

for (int x = 0; x < identityList.Length; x++)
{
 if (identityList[x].Equals("Group1Users"))
 {
  accessdenied = true;
 }
 else if (identityList[x].Equals("Group2Users"))
 {
  accessdenied = true;
 }
}