I have been tasked with restricting the websites viewable for a small group of employees. They only need to be able to see 3-4 sites related to work. I know I can create a proxy server, but for a group this small I'd rather do it via group policy or content restrictions.
I added all the sites as approved in content advisor. I have been unable to find a GP to block all sites not approved.
I also looked into the security zones, but didn't see anyway to block the internet and view only the trusted sites.