Sorry Stroller, if anti Zionism means denial of the state of Israel's right to exist, which I think at root it does if Zionism means the development and protection of a Jewish nation in the geographical area of Israel (which I know it does), then it may be a valid 'political' position but it is very different from opposing and challenging some (or even the majority) of the policies and actions of the government of Israel (which I would both understand and agree with). It means you want to see the Jewish state removed and even if that doesn't equate to killing all Jews (or transporting them to the USA) it's pretty obviously anti Semitic. Livingstone, Galloway (who I see has waded into this as well) and these extremist newcomers are explicitly and unashamedly anti Zionist. The way they slyly allude to 'the Israel lobby' and its mysterious influence seriously creeps me out. They are also Hamas fellow travellers, as is Corbyn, and while Hamas has softened its tone recently, it is an Islamic fundamentalist explicitly anti Semitic organisation (read their Covenant). These people also couldn't give a **** about the Labour Party, it's just a vehicle as far as they are concerned, a means to an end, and that end is, I strongly suspect, anti democratic, given their inability to tolerate any opposing views.
Even if the Conservative Party was packed to the rafters with racists that doesn't provide any excuse for the Labour Party to be the same. It really pisses me off because the Labour Party, the only political organisation I have ever been a member of (years ago before the waves of cynicism overtook me), which has always been a bit of a shambles precisely because it allowed dissent, is now an unpleasant, incompetent, unrepresentative shambles, and increasingly intolerant. The nastiness hasn't even started yet, all these Corbynistas who joined specifically to vote for him will soon start reliving the 80s and the Militant Tendency/ Socialist Action, under the Momentum banner. Even some of the people, like Jon Lansmann and Simon Fletcher, are the same as way back then. Except now they have a leader who agrees with them. Thank God he's not a very good one.
Hopefully I have overstated all of the above.