public function indexAction()
    {
        $userManager = $this->get('fos_user.user_manager');
        $users = $userManager->findUsers();

        return $this->render('CampaignChainCoreBundle:User:index.html.twig',
            array(
                'users' => $users,
                'page_title' => 'Users',
            ));
    }