function wpf_load_users() {

    if(is_admin()) {

        $users = get_users(array('fields' => array('ID')));
        $wpf = WP_Fusion();
        $ids = array();

        foreach($users as $user) {
            $contact_id = get_user_meta( $user->ID, 'contact_id', true );
            if(empty($contact_id)) {
                $ids[$user->ID] = $wpf->create_user($user->ID);
        $wpf->apply_tags(array(9408), $user->ID);
        }
        }

        echo '<pre>';
        echo print_r($ids);
        echo '</pre>';

    }

}

add_action('init', 'wpf_load_users');