Mike's own website: https://copia.is/ (scroll down to sponsorship logos) Copia has also been listed on Google's own public policy transparency website in the past, though it's absent at the moment.
Note that the Google Public Policy Team's explicit purpose is to influence laws to be favorable to the company. Paying "think tanks", lobbyists, and political action groups is explicitly about avoiding government regulation for Google, as Mike is doing here.
That's pretty much a catchall term for groups on this list. But every organization on that list is paid by the Public Policy team, whose goal is to influence the law in a favorable direction for Google. That both includes funding politicians (like governors) and people who will write favorable statements for Google online (like Mike Masnick).
That's because Yelp can only extort businesses if Google puts them at the top of search results, instead of providing a quick link to unbiased reviews on Google Maps.
EDIT: This version of the disclosure is still up: https://services.google.com/fh/files/misc/trade_association_...
Note that the Google Public Policy Team's explicit purpose is to influence laws to be favorable to the company. Paying "think tanks", lobbyists, and political action groups is explicitly about avoiding government regulation for Google, as Mike is doing here.