How to prevent a program from accessing to the Internet?

Sat Oct 18 17:54:24 UTC 2014

On Sat, Oct 18, 2014 at 12:33:29 -0400,
  Rahul Sundaram <metherid at gmail.com> wrote:
>
>Filed a RFE a few hours before
>
>https://bugzilla.redhat.com/show_bug.cgi?id=1154302

According to the man page for sandbox, processes don't get network access. 
I didn't see a way to turn it on in the man page.

I tried testing in and it isn't working for me in rawhide or f21. It looks 
like I'll need to file a bug.