The letter published on Friday also slammed the full page ad calling Lorde a “bigot” published in the Washington Post and funded by Rabbi Shmuley Boteach’s World Values Network organization.

Among the signers of the letter were actor Mark Ruffalo, singer Peter Gabriel, Pink Floyd front man Roger Wates, actor John Cusack, British director Ken Loach, writer Angela Davis and writer Alice Walker.

“We deplore the bullying tactics being used to defend injustice against Palestinians and to suppress an artist’s freedom of conscience. We support Lorde’s right to take a stand,” the letter says. It also says that Boteach “has nothing to teach artists about human rights.”

Lorde said last month she would cancel her Tel Aviv concert less than a week after it was announced following criticism by pro-Palestinian fans in her native New Zealand.

New Zealanders Nadia Abu-Shanab and Justine Sachs — the former Palestinian and the latter Jewish — wrote an open letter on the website The Spinoff saying that Lorde’s scheduled performance in Israel “sends the wrong message.”

“Playing in Tel Aviv will be seen as giving support to the policies of the Israeli government, even if you make no comment on the political situation,” they wrote.

Lorde said in a statement about the cancellation that she educated herself about Israel before booking the concert, but that “I didn’t make the right call on this one.”