Hundreds of New Yorkers gathered outside the office of New York Gov. Andrew Cuomo on Thursday, protesting a new pro-Israel policy that legal groups warn is “McCarthyite” and unconstitutional.

Cuomo signed an executive order this weekend that punishes institutions and companies that support a boycott of Israel on behalf of Palestinian human rights.

“Despite being planned at a very short notice, the protest had a robust turnout and a powerful presence by hundreds of outraged human rights advocates,” said Hani Ghazi, a member of Adalah-NY, the New York Campaign for the Boycott of Israel, the third group that co-organized the demonstration.