The First Amendment forbids the government from forcing you to disclose the groups or organizations that you support. That is because the First Amendment guarantees our right to associate with others, and associational privacy is fundamental to that freedom. Nevertheless, in complete disregard for these associational rights, the Securities and Exchange Commission currently requires investors to disclose the businesses they support financially. No government agency has the authority to compel Americans to disclose the companies in which they invest. Yet for several years, the SEC has done exactly that through a surveillance program called the Consolidated Audit Trail (CAT). The...