Anti-zionism is not anti-semitism. Zionism itself is anti-semitic. It is the ideology of creating Israel as an ethnostate, it was a fringe of jews at one point in time but the people who wanted to kick the jews out of Europe popularised and supported its growth(hence why it is itself antisemitic in origin).

Anti-zionism is literally just being against the state of Israel as a jewish ethnostate and apartheid regime. It is also supported by a very large number of internationalist jewish organisations.

Jewish Voice for Peace has an excellent explanatory article that I am begging you to read and educate yourself with. There is no "conspiracy theory" here, this is a word that has a specific meaning that I am using accurately that has nothing to do with what I assume is some fascist thing that you've heard the word also exists in (protocols of the elders zion perhaps?) and are getting muddled with.

As for mossad having funded certain people currently organising inside the labour party, this is just factually correct. We have the receipts and it's openly known.