More than 300 Jewish survivors of the Holocaust and descendants of survivors have issued a public statement condemning Israel's "genocide" of the Palestinian people in Gaza.
The statement was released by the International Jewish Anti-Zionist Network and was placed as an advertisement in the New York Times.
It calls for the blockade of Gaza to be lifted and Israel to be boycotted.
The signatories expressed alarm at the "colonization of historic Palestine".
It condemns the "racist dehumanisation of Palestinians in Israeli society, which has reached fever pitch".
"As Jewish survivors and descendants of survivors and victims of the Nazi genocide we unequivocally condemn the massacre of Palestinians in Gaza and the ongoing occupation and colonization of historic Palestine," the statement says.
"We further condemn the United States for providing Israel with the funding to carry out the attack, and Western states more generally for using their diplomatic muscle to protect Israel from condemnation.
"Genocide begins with the silence of the world."
The statement goes on to call for an economic, cultural and academic boycott of Israel.
Organisers say that the statement was drafted as a response to an advertisement written by Nobel prize-winning author Elie Wiesel and published in many newspapers which accused Hamas of "child sacrifice" and behaving like Nazis.
More than 2,090 Palestinians - mostly civilians - and 67 Israelis have been killed in recent weeks.