Has ADL supported resolutions acknowledging acts of genocide and resolutions condemning genocide denial before?

Absolutely.

Below, please find a partial list of US Congress and International resolutions that the ADL has supported.

July 22, 2004
Concurrent House Resolution 467 and Senate Resolution 133
“Congress declares that the atrocities unfolding in Darfur, Sudan, are genocide, and urges the Administration to refer to such atrocities as genocide”

ADL Press statement regarding Resolutions 467/133:
July 23, 2004…The Anti-Defamation League (ADL) today commended Congress for condemning the atrocities being committed in the Darfur region of Sudan as "genocide."
"We applaud Congress for this bipartisan effort to marshal support for a more robust U.S. response to the genocidal atrocities in Darfur," said Barbara B. Balser, ADL National Chair, and Abraham H. Foxman, ADL National Director. "As Jews, we are acutely aware of the lesson of the Holocaust, to never again remain silent in the face of such acts. We are confronting a crisis which challenges us to action while there is still time, and not to delay as in the case of Rwanda. Time is running out, but American pressure can still make a difference and reduce the death toll in Darfur."


United Nations General Assembly Resolution denouncing denial of the Holocaust
Introduced by the U.S. representative on the eve of International Holocaust Remembrance Day (UNGA res 60/7)
January, 26 2007
The ADL encouraged support by writing (ADL letter below) to the UN representatives who had not endorsed the resolution. Those countries included: China, Egypt, Jordan, India, Saudi Arabia, South Africa, United Arab Emirates, Qatar, Brazil and Japan.

January 23, 2007
“It is a sad reality that the denial of the Holocaust is becoming increasingly common. Just last month, Iran held an international conference questioning the Holocaust which brought together some of the world's leading anti-Semites and Holocaust deniers. The United Nations itself is not immune from this poison. The Iranian ambassador to the Human Rights Council sent a letter on January 8 to the council president defending the Holocaust denial conference.”

"We urge you to support this important declaration by the international community reinforcing that it will never forget the Holocaust and rejecting those who seek to deny it. Furthermore, such a declaration is critical to ensuring that the world does not ignore current and future acts of genocide"