This document from 1979 is titled “Has the Libertarian Movement Gone Kooky? A Spirited Exchange.” Here is Charles Koch’s response to that question:

“As a long-time supporter of the limited government, private property, free enterprise system, I was dismayed to read in the June 8 National Review that my support was dangerous to liberty. The attack becomes understandable only with the realization that the authors of the two distorted, erroneous articles are not, themselves, advocates of the free enterprise system.”

Other operatives funded by Koch, such as Ed Crane, also responded to the question, although their financial ties to Koch were not described in the piece.