Mr Yasin is not to be confused with the Labour MP for Bedford, who has a similar name.
Other material on the account included a video describing the Rothschilds as the world’s “most wicked and wealthiest family” and a 2015 cartoon showing broadcasters including the BBC and CNN ignoring butchered Palestinians and focusing their camera on a crying baby wearing a Star of David.
Although many activists and members have been accused of antisemitic attitudes, Mr Yasin would be the first member of staff to be implicated, the newspaper said.
His Twitter account, now deleted, showed a photograph of him alongside party leader Jeremy Corbyn at the Labour conference in Liverpool on September 27 this year.
He wrote: “great to catch up with Labour colleagues and the Shadow Cabinet at the staff event yesterday. JC for PM.”