Used to shut down criticism of Israel?
Not all agree that criticising Israel is anti-semitic.
Extract from link below:
C. Israel and Palestine: examples that, on the face of it, are not antisemitic
(whether or not one approves of the view or action)
Supporting the Palestinian demand for justice and the full grant of their political, national, civil and human rights, as encapsulated in international law.
Criticizing or opposing Zionism as a form of nationalism, or arguing for a variety of constitutional arrangements for Jews and Palestinians in the area between the Jordan River and the Mediterranean. It is not antisemitic to support arrangements that accord full equality to all inhabitants “between the river and the sea,” whether in two states, a binational state, unitary democratic state, federal state, or in whatever form.
Evidence-based criticism of Israel as a state. This includes its institutions and founding principles. It also includes its policies and practices, domestic and abroad, such as the conduct of Israel in the West Bank and Gaza, the role Israel plays in the region, or any other way in which, as a state, it influences events in the world. It is not antisemitic to point out systematic racial discrimination. In general, the same norms of debate that apply to other states and to other conflicts over national self-determina- tion apply in the case of Israel and Palestine. Thus, even if contentious, it is not antisemitic, in and of itself, to compare Israel with other historical cases, including settler-colonialism or apartheid.
Boycott, divestment and sanctions are commonplace, non-violent forms of political protest against states. In the Israeli case they are not, in and of themselves, antisemitic.
Political speech does not have to be measured, proportional, tempered, or reasonable to be protected under article 19 of the Universal Declaration of Human Rights or article 10 of the European Conven- tion on Human Rights and other human rights instruments. Criticism that some may see as excessive or contentious, or as reflecting a “double standard,” is not, in and of itself, antisemitic. In general, the line between antisemitic and non-antisemitic speech is different from the line between unreasonable and reasonable speech.
https://jerusalemdeclaration.org/