R – Struts redirect from model

I'm trying to implement a security model where the model of secured pages inherits from a SecureSupport. I don't know how or if I can redirect from a constructor, however. See below:

public class SecureSupport extends ActionSupport {
    private Map session;

    public SecureSupport  throws Exception
    {
        session = ActionContext.getContext().getSession();

        if(!session.containsKey("User"))
        {
            // redirect from here
        }
        return SUCCESS;
    }