Jeffrey Goldberg explains it:
“This last theory of his was largely forgotten until last week, when Greta Berlin, a co-founder of the Free Gaza Movement, published a message on the group’s Twitter feed: “Zionists operated the concentration camps and helped murder millions of innocent Jews.” It contained a link to a video of Mullins delivering his message.
The Free Gaza group, the leading edge of the international campaign to delegitimize Israel and bring about its end as the national home of the Jewish people, has always argued that it isn’t anti-Semitic, and is merely trying to break Israel’s blockade of the Gaza Strip. The group came to public attention in May 2010, when it organized a flotilla of ships to attempt to break the blockade. Israeli commandos boarded the ships and were set upon by passengers wielding pipes and knives. In a terrible overreaction, they responded by opening fire, killing nine. The incident has nearly destroyed Turkish-Israeli relations, and helped make the flotilla cause popular across the Middle East and Europe.
Then Berlin’s Twitter message was discovered last week. Berlin said she posted the video without watching it, and that the message was meant for a private Facebook group. Her critics pointed out that the private sharing of Nazi propaganda doesn’t fall into a different moral category than the public sharing of Nazi propaganda, and so she then argued the message was meant to be part of a broader discussion about the nature of hateful propaganda. Free Gaza has officially disowned the post and taken it down.
But this isn’t Berlin’s first dalliance with purveyors of anti-Semitism. She has also endorsed the work of an ex-Israeli Holocaust revisionist (yes, such a person exists) named Gilad Atzmon, author of “The Wandering Who?” Atzmon has argued, among other things, that it was the Jews who persecuted Hitler, and that Jews who commemorate the Holocaust are followers of the “the most sinister religion known to man.”