In 2008 NIAC filed a defamation lawsuit against one of its critics to silence him. In 2012 a court dismissed the case and punished the NIAC and its president, Trita Parsi, for lying to the court, withholding and concealing documents and other abuses. In February 2015, the court of appeals upheld the initial ruling that NIAC and Parsi engaged in systematic abuse of discovery process and repeated false and misleading declarations to the court
Since 1999 when Parsi and Namazi from "Atieh group" proposed creation of Iranian-American lobby in US, NIAC and Atieh have been working together to lobby in Washington against sanctions. Atieh is a Tehran based business conglomerate that has multiple ties to the regime and helps foreign corporations do business in Iran.
In 2006 the Iranian nuclear file was referred to the UN Security Council and international pressure notably from the US administration mounted against Iran. The Iranian regime launched a campaign to establish contacts with anti-Bush politicians and exploit Political Divisions in Washington over policy with Iran.
NIAC’s internal documents show that during 2006-2007, NIAC’s president Trita Parsi played an important role in this campaign and arranged meetings between Javad Zarif, the Iranian ambassador to the UN and US Congress members who according to Parsi : ”were disillusioned with Bush foreign policy and are tired to sit on the sidelines as Bush undermines the US’s global position. They are willing to take matters in their own hands and they accept the political risk that comes with it.”
The documents show NIAC coordinated with Iranian ambassador to influence US policy with Iran.
Later in 2008 and 2009, Parsi and NIAC had an active role in arranging the meeting between US politicians and Iranian officials in Europe. The Iranian delegations was led by Hashemi Samareh, chief advisor and confident of President Mahmoud Ahmadinejad.
Public and court documents show that Parsi and his boss Bob Ney played a key role in this affair that was designed to manipulate US administration, lift the pressure off the Iranian regime and push the US government to dismantle the Iranian opposition group
NIAC's main lobby partner in the U.S. has been the National Foreign Trade Council (NFTC), representing large US corporations and its lobbying arm USA*Engage. NIAC's internal emails and documents show their joint lobby in Congress to oppose US sanctions against Iran
Corrupted and convicted Congressman Bob Ney was bribed by two Iran related businessmen and helped them to buy a VIP airplane for Iranian leaders. Ney was Trita Parsi's boss and his close ally for 10 years. Together, they lobbied in Congress for friendlier policy with Iran and removal of sanctions
Parsi’s book and statements depict Israel as the main hurdle preventing rapprochement between Iran and the US. Parsi presents himself as the champion of anti-AIPAC crusade, a David versus Goliath. His campaign to blame Israel is a key part of his lobby for a friendlier US policy toward Tehran and removal of sanctions
A December 2012 report prepared by the Pentagon names two individuals as Iranian Intelligence Agents. NIAC worked with them and enlisted their help in organizing a Congressional briefing. NIAC also worked with the editor of Iran Interlink, identified to be run by Iranian intelligence service
Court documents show that Trita Parsi and NIAC violated lobbying laws and filed fraudulent tax returns. While Parsi had been engaged in lobbying since 1997 and NIAC had extensively lobbied since 2006, they continued to report zero percent lobbying in their tax returns until November 2009, when The Washington Times decided to run a story about NIAC's unreported lobbying