The only verifiable abuse of Luciana Berger was from neo-nazis.
To state the blindingly obvious, it isn't possible to identify individual twitter accounts. Any one can create them. It also isn't possible to detect their actual political affiliation. If they bother to hide their IP address, you can't detect their location, assuming twitter would give you that in the first place (they wouldn't). You have nothing.
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And what would these actions be? Let me be frank. I don't think there were any actions he could have taken, but it would be very entertaining to hear you try and justify that statement. The media were out to smear him and, in the absence of any actual dirt they made some shit up, and people like you went along with it. You either badly misunderstood how these things work, or you are using some kind of post hoc rationalization to justify an arbitrary dislike of the man (despite you claiming to like him).
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I'd really like to see some of Corbyn's critics do better. Corbyn won two leadership elections, trebled the party membership, and wiped out the government's majority in 2017. The entire political establishment was against him including most of his own party. Do you really think it is that easy to overcome billions of pounds worth of corporate power?
Realistically most of the people who are saying "he should have done this" would have been removed from office in two months. I mean, prove me wrong, enter politics and show us all how easy it is. I'd be happy to be proved wrong if we could get an even vaguely competent social democratic government.
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For the benefit of the spectacularly ignorant:
Zionism is a term used to describe an Israeli nationalist ideology. It is NOT an anti-semitic slur, nor is it perjorative: many call themselves Zionists.
All nationalist ideologies by definition are repudiated by the far left which focuses on the class, rather than the nationality, of the individual. Criticism of wahhabism (Saudi Islamic Extremism), American exceptionalism, Nazism or whig ideology (British nationalism) is not by definition racist or sectarian, and it would be ludicrous to suggest otherwise. Most left-wing British people who criticize Zionism oppose the conservative, warmongering ideology of their own state, that does not make them anglophobes. Indeed there are many actual Jews amongst the ranks of anti-Zionists including some holocaust survivors.
But thanks for blundering into this thread with your own ignorant opinion and giving further support to an unsubstantiated smear campaign. In other news we have 50,000 dead here because the public elected a fucking idiot, mainly due to this type of disinformation.