Koch Brothers Sue Widow of Cato Chairman Emeritus Over Stock

Billionaire brothers Charles G. Koch, co-founder of the Cato Institute, and David H. Koch sued the free-market advocacy group, and the widow of Chairman Emeritus William Niskanen seeking control of his shares.

Niskanen’s October death triggered an obligation for his wife and estate representative, Kathryn Washburn, to offer his shares to the institute and, if it declined to buy them, then to the surviving shareholders, according to a copy of the complaint obtained by Bloomberg News.