What you have posted seems to contain no facts about anti-Semitic words or acts so it is difficult to answer. It's is all supposition.
I'm not posting their hate-filled, conspiracist and anti-Semitic bile on GN! My posts would be deleted, and quite rightly so. I have not read about it in the MSM, so we could be talking about something different, but I have read the report. So it's not really supposition. I've seen the screen grabs, read the comments. If you just want to read the MSM that you criticise, that's up to you. I'm not surprised that a newspaper would not print the content though. It is vile, extreme and uses language that would easily be considered hate speech.
ww - that was not the content in these Facebook groups though. It's not what they were talking about. I'm afraid it's the apologists here who are full of supposition and assumptions!
You can choose to vote for people who hang out with and facilitate meetings and trips for people who hate Jews and think they have no place on the planet. That's your choice. I'll judge Corbyn by my own ethics. That's my choice.