A new document providing rare insight into the political machine of the Koch Brothers has surfaced revealing the names of up to 40 donors, as well as senior Koch officials, Washington Post reported.

The list, published by Mother Jones, was mistakenly left behind at a donor conference and includes various corporate executives, real-estate and hedge fund billionaires and GOP financiers.

The list also includes Papa John pizza chain founder and hard-core Republican John Schnatter, Kenneth Griffin, the chief executive of Citadel, Silicon Valley real estate investor Carl Berg (worth $1.1 billion) and owner of Omni Hotels and Gold’s Gym.

What’s more, it appears Charles Koch was scheduled to hold private meetings with at least nine of the contributors including private equity investor John Childs and TRT Holding co-founder Robert Rowling who is worth around $4.9 billion.

Those in attendance also contributed to American Crossroads, the super PAC co-founded by Karl Rove, with Rowling directing $3.5 million to the cause.

Officials from Freedom Partners, a tax-exempt business league funding AFP was also scheduled at the meetings.

The Koch Brothers have fought hard to protect the identity of its financial backers and shield its money-making schemes by operating through tax-exempt groups and LLCs.