0 money from people or organizations whose names are not known or revealed, that may be connected to illegal or harmful activities:
He had millions in a secret account in a private bank: dark money, paid to his father by the British secret service.
A new law on dark money proposed nonprofits would have to disclose donors who give more than $10,000 if geared toward “influencing or attempting to influence” elections.
Loopholes in campaign disclosure rules have made so-called dark money – funds from groups that do not disclose their donors – disturbingly common.