Article 19, the Global Campaign for Free Expression, has launched an appeal on behalf of the Iranian-Americans detained in Iran.  The full appeal text can be seen here (PDF).  According to the press release:

ARTICLE 19 calls for the immediate release of three U.S.-Iranian citizens charged by the Iranian authorities with “acting against national security by engaging in propaganda against the Islamic republic by the method of spying on behalf of foreigners”, and urges its partners, contacts and supporters to sign on to the petitions to free Dr. Kian Tajbakhsh, Haleh Esfandiari and Ali Shakeri.

Parnaz (Nazi) Azima, journalist for Radio Farda, the Persian-language service run jointly by Radio Free Europe/Radio Liberty and Voice of America has also been charged by the Iranian authorities with the same charges. Mrs Azima has recently been released on bail, but is still facing prosecution and the prospect of lengthy incarceration and possibly the death sentence if convicted of the national security charges.

The other accused are Kian Tajbakhsh, a social scientist at the New School in New York who has worked as a consultant for the Open Society Institute and the World Bank; Haleh Esfandiari, director of the Middle East programme at the Washington-based Woodrow Wilson International Center for Scholars; and Ali Shakeri, a founding board member of the University of California, Irvine, Center for Citizen Peacebuilding.

ARTICLE 19 is alarmed by the deterioration of the protection of the right to freedom of expression in Iran, and in particular by the repeated attempts by the Iranian authorities to isolate the Iranian media and academic community from its global counterparts, and curtail cross-cultural dialogues and debates, with the view of maintaining tight control over information, ideas, and opinions. Dual national American-Iranians have been particularly targeted, and their basic right to a fair trial denied.