Comey's tweet had CHS, so I went and had a little dig around and came across this.

CHS Inc. is a Fortune 100 business owned by United States agricultural cooperatives,

farmers, ranchers, and thousands of preferred stock holders. Based in Inver Grove Heights, Minnesota,[1] it owns and operates various food processing and wholesale, farm supply, Cenex brand fuel, financial services and retail businesses, and is a co-owner of Ventura Foods, a vegetable oil processor.

It is ranked 1st on the National Cooperative Bank Co-op 100 list of mutuals and cooperatives (ranked by 2012 revenue), and 69th (by 2012 revenue) in the Fortune 500 2013 list of United States corporations

https://en.wikipedia.org/wiki/CHS_Inc.

The president and CEO of CHS is Carl Casale, who was a former executive vice president and chief financial officer for Monsanto Company (agent orange, Roundup, PCBs, GMOs, and the nemesis of co-ops) from September 2009 until December 31, 2010. Prior to that he was Executive Vice President, Strategy and Operations for Monsanto from 2007 to 2009 and Executive Vice President, North America and Latin America North for Monsanto from 2003 to 2007, and Vice President, North America from 2000 to 2003. As CFO he authorized $150 million in cash and trade incentives (i.e., bribes) to Latin American farmers to encourage them to use Monsanto's Roundup.

http://www.geo.coop/story/corrupting-role-corporate-co-ops