Koch Brother power and access to lawmakers is largely secret though signs are clear

Who Controls the Koch Brother Power Political Network? ASMI, SLAH and TOHE

Democracy, elections, and voting at Democracy Chronicles

From Wikipedia:

The Koch family foundations are a related group of non-profit organizations that began with the establishment of the Fred and Mary Koch Foundation in 1953, and now includes the Charles Koch Foundation, the David H. Koch Charitable Foundation and the Koch Cultural Trust. The organizations collectively have a stated goal of “advancing liberty and freedom” through the support of various causes which “further social progress and sustainable prosperity.”[11] In addition to the direct action of the non-profits, the groups have also contributed financially to other philanthropic organizations in the fields of research, public well-being, arts, and education, including contributions to scholarship programs, university support, and loan assistance through organizations like the United Negro College Fund.