This ($) is troubling: “Svoboda was challenged by the two Republican commissioners on the FEC, Mason and Hans von Spakovsky, who asked about the constitutional basis for requiring disclosure.”
On the constitutionality of disclosure, see here Svoboda also added “that the FEC has little choice about what to do on the matter because disclosure is still required under BCRA. The Supreme Court’s decision in WRTL struck down ad funding restrictions but left the disclosure requirement intact.”