Doing business with Iran is a dangerous proposition, German companies were warned on Monday in a full-page advertisement published by an advocacy group in a major Frankfurt newspaper.

The ad, authored by the advocacy group United Against Nuclear Iran (UANI), ran in the Frankfurter Allgemeine Zeitung as a two-day economic conference — titled “Market Opportunities in Iran” — got underway in the German financial hub.

In a statement released on Monday, UANI senior adviser and former director of Germany’s Federal Intelligence Service Dr. August Hanning said:

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The only way for German companies to avoid the risks inherent in the Iranian market is to abandon these business pursuits entirely. The Iranian regime remains a bad actor in the global community, given its ongoing extensive support of terrorism and its high profile and deliberate promotion of Holocaust denial. German business leaders should not reward this noxious regime until substantial and permanent reforms are implemented.

As was reported by The Algemeiner, a similar UANI ad published in the Financial Times “soured the mood” at the Iran Investment Summit in Singapore last month.

Following the nuclear agreement it reached with six world powers in July 2015 — and the subsequent easing of international economic sanctions — Iran has been seeking to attract foreign business and investment. This effort has been boosted by US Secretary of State John Kerry, who in May said that European companies should not use remaining US sanctions on the Iranian regime as a reason to refrain from making deals with the Islamic Republic.

As The Algemeiner reported, a recent American Israel Public Affairs Committee (AIPAC) memo said the Obama administration had “opened the door to business with Iran’s leading terrorist group — the Islamic Revolutionary Guard Corps (IRGC),” with the Treasury Department’s move last month to allow Tehran greater access to the US dollar.

According to its website, UANI  — founded in 2008 by Ambassador Mark D. Wallace, the late Ambassador Richard Holbrooke, former CIA Director Jim Woolsey and Middle East expert Dennis Ross — is a “not-for-profit, non-partisan, advocacy group that seeks to prevent Iran from fulfilling its ambition to obtain nuclear weapons. UANI’s private sanctions campaigns and state and Federal legislative initiatives focus on ending the economic and financial support of the Iranian regime by corporations at a time when the international community is attempting to compel Iran to abandon its illegal nuclear weapons program, support for terrorism and gross human rights violations.”