The last time far-left supported far-right was in 1939. With Molotov-Ribbentrop pact left-wing USSR joined forces with right-wing Nazi Germany. This union ended up with the Holocaust as we all know.
Now, when I see left "progressives" teaming up with right terrorist groups on a basis of hating Jews, it doesn't make me feel good.
No, the Molotov-Ribbentrop pact did not cause or lead to the Holocaust. Jewish people were already being persecuted and sent to concentration camps long before 1939.
Now, when I see left "progressives" teaming up with right terrorist groups on a basis of hating Jews
I don't think you know what's going on that's not what's happening. No one is joining up with any terrorist groups. All that is happening is that people are saying that maybe the war shouldn't be happening the terrorist groups need dealing with but the way you do that isn't to bomb the entire civilian population out of existence.
Wars are not "happening". One group of people attack another group of people, and another group of people have to defend themselves.
In order to "stop war" you're saying that another group of people should just die without fighting back.
The far right groups present were mostly on the cenotaph protection thing, which the Palestine march was never going near. There were arrests there for hate speech.
Given Hamas is a proscribed group in the UK, and the organisers were working in close collaboration with the Met, please ellaborate with evidence your rather rowdy claim that the Met just organised a protest with criminals.