A 501(c)(4) is a patriotic tax-exempt status that allows people to donate piles and piles of money anonymously to a shell company which can later donate their secret money to a SuperPAC of their own chosing. A 501(c)(4) organization does not require donor disclosure, perfect for that shy billionaire who would like to give away their vast fortune anonymously. Some donors are just too modest and shy to take credit for their civic duty of giving unlimited free money.