def find_fraudulous(form_df, filter_funcs):
    """
    Find the fraudulous users in form_df using each of the filter_functions

    Args:
        form_df (pd.Df): formular to filter
        filter_funcs(func): function returning a list of fraudulous user from a df

    Return:
        [list of str]: list of fraudulent users
    """

    fraudulous_users = {}
    for filter_func in filter_funcs:
        func_name = str(filter_func).split()[1]
        new_fraud_users = filter_func(form_df)
        fraudulous_users[func_name] = new_fraud_users
    return fraudulous_users