The DNS Root Server System Advisory Committee is an ICANN committee. However, the root zone is controlled by the United States Department of Commerce who must approve all changes to the root zone file requested by ICANN. ICANN's bylaws[12] assign authority over the operation of the root nameservers of the Domain Name System to the DNS Root Server System Advisory Committee.
Full explanation:
http://en.wikipedia.org/wiki/Root-servers.net#Root_server_addresses
Google Inc. is an American multinational public corporation
http://en.wikipedia.org/wiki/Google
But we know Google is linked to the US Gov.