The article sought to draw comparisons between the Holocaust and the Israeli-Palestinian conflict.
It claimed that a “tendency to exaggerate the number of Jewish victims” could have been used as a “cover for the daily Israeli crimes against the indigenous people of Palestine.
“This exaggeration has been an attempt to label all those who possess the courage to reject the occupation’s policies and stand in solidarity with the just struggle of our people as ‘antisemitic.'”
The tweet triggered widespread anger on Twitter.
David Toube, from the think tank the Quilliam Foundation, called it "quite a spectacular low point" for PSC.
When asked about the tweet, a spokesperson for the PSC said it took accusations of antisemitism “very seriously.”
In a statement the PSC said: “As an organisation we are very clear that antisemitism, including any attempt to minimise or deny the Holocaust, has no place anywhere in the campaign for Palestinian human rights.
"We strive to ensure that all of our communications, both local and national, embody our values of anti-racism and anti-discrimination, and this is reflected in our guidance and training for members and branches.”
The anger at the PSC comes as people around the world mark victims of the Holocaust on the 75th anniversary of the liberation of Auschwitz-Birkenau.