def get_google_project_membership(project_id, google_cloud_manager):
    """
    Returns GCM get_project_membership() result, which is a list of all
    members on the projects IAM

    Args:
        project_id(str): unique id for project
        google_cloud_manager(GoogleCloudManager): cloud manager instance

    Returns
        List(GooglePolicyMember): list of members on project's IAM
    """

    return google_cloud_manager.get_project_membership(project_id)