Roll Call: “‘The sources of untraceable money going to super PACs included 501(c)(4) social welfare groups, which face no disclosure requirements, and shell corporations, which appear to “exist not to conduct regular business but rather simply to necessitate an extra layer of research to discover the true source of contributed funds,’ according to the report. A third source of untraceable donations was money transfers from one super PAC to another, the report stated, in cases where the super PAC making the contribution had itself received funding from one or more nonprofits.”