Is closer to the far right than it is to the left in general, as like space, politics warps back amongst itself. Though what you call far-left here is generally not as far left as they think they are.

As for sources, curiously, most of what is not allowed here for these types of biased thinking such as anti-Semitism sites are usually paleo-Libertarian and generally Far Right in bent. Yes, a few sites are not allowed here in I/P which are leftist in nature, but mostly because they lack gravitas (ie, are vanity), than biased reasons.

Of the Libertarian (where most of the anti-Semitic sites seem to be associated), the main reason they've garnered any coin among the left is that they are jealous/in competition with the Neo-Cons for control of the Right and leftists are sometimes over-eager to believe "an enemy of my enemy is my ally" without realizing this other group is also an enemy.