cant figure out how to interate over a list as a comparisson for an if statement

I am trying to do the following:

I have a list of users I want to remove from the database in the variable "users_to_rm". and I have setup a function that iterates though the users usernames field[0] on the list "users_to_rm" and deletes all users beside the user in "excluded_user"

def remove_users(users_to_rm):
""" Remove users and associated extensions that are no longer in the database  """
excluded_user = "supervisor"
for users in users_to_rm:
    if users[0] == excluded_user:
        pass
    else:
        payloads_user_rm = '{"jsonrpc": "2.0", "method": "deleteUser", "id": "05", "params": {"username":' + '"' + str(users[0]) + '"' +'}}'

        result = requests.request("GET", ucware_cfg.url_admin_user, data=payloads_user_rm, headers=ucware_cfg.headers)
        Reports.log(Reports.LogLevel.INFO, "#########\nUser " + str(extensions[0]) + " removed", send_mail=False)
        log_http_result(result)

Now, I would like that the excluded_user variable to be a list of users like this:

excluded_user=["supervisor","testuser","testuser2"]

I would like my fucntion to do the same as it is doing now, but check the list of users in excluded_user and pass all those in the list.

Hope I made any sense and thank you for your help.