The blog post on ex post facto stirred up a flurry of e-mails between members of the society. It switched on a light bulb for some that the State Department and the IRS were trying to pull a fast one, and that those who were following rules at the time of their relinquishment were not required to follow the new rules.
The United States of America is creating ex post facto laws by insisting that persons born in the United States who lost their citizenship in the past but failed to inform the State Department are now once again citizens who must file income taxes and FBARs in the United States. The US Constitution clearly forbids Congress and the states from enacting ex post facto laws (Article I, sec. 9-10).