The US refuses to issue a Visa for Hamid Aboutalebi, Irans newly appointed ambassador to the UN.
Mr. Aboutalebi is considered a „security risk“.

„The US accuses Hamid Aboutalebi of links to the group that seized the US embassy in Tehran in 1979, an incident that soured ties between the countries.
Mr Aboutalebi says that he only acted as a translator for the group.“
http://www.bbc.com/news/world-us-canada-27000232

He has been wrongfully portrayed as one of the hostage takers.

„Mr Aboutalebi has previously served as Iran’s ambassador to Belgium, the European Union, Italy and Australia.“
Apparently those countries did not feel their security at risk due to Mr. Aboutalebis presence.

„Aboutalebi was 22 years old when he served as an interpreter for the students who had seized the embassy out of pent-up anger over long-standing U.S. support for the autocratic shah of Iran.“
http://www.latimes.com/opinion/editorials/la-ed-ambassador-to-united-nations-iran-hostage-cr-20140410,0,7573953.story#ixzz2ynDVGwQv

This is yet another act of american double standard given that the US assigned former CIA director Richard Helms as ambassador to Iran from 1973-1977.