Google has added a hyperlink to the main brand site when Google displays the knowledge graph in the search results.
If you search for brands, such as [pbs], [bbc], [fox news], [yahoo] and so on, next to the site name, near the company description, you will see the clickable URL.
Here is a picture:
This may alleviate some of the concern publishers expressed over the knowledge graph.
Hat tip to Rahul Mistry from http://bluepostdigital.com/ for sending this our way.