Board Thread:Speculation, Theories, and Rumors/@comment-25400375-20150315043543/@comment-679780-20150409024547

Well, I believe United Federations is Sonic's world equivilent to United States and Shadow's game is most evident to it (White House, American themed President, etc). GUN is a United Federation agency which serves to establish order of United Federation through intelligence and millitary. As for why GUN were free to investigate Project Solaris in Soleanna is comparible to 007 movies where MI6 send James Bond to foreign countries to investigate British or international threats.

Thats all I believe on what United Federation and GUN is in Sonic's world.