Antisemitism is rife and can be found in "our politics" and "online", according to the chief executive of the Holocaust Educational Trust.
Karen Pollock appeared on the breakfast show to discuss the importance of remembering the events of the Second World War ahead of Holocaust memorial day on Sunday.
The charity CEO told talkRADIO's Julia Hartley-Brewer that the liberation of the concentration camps did not mark the end of discrimination and prejudice towards Jews.
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"Sadly antisemitism didn't end in 1945 at the liberation of the camps. We still see it today, we see it in our politics, we see it online," she said.
"For the sake of those that died and those that are still with us, we have to have a very clear voice and stand up against it."
'If people are doing things in your name, you have to call it out'
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The Labour party has faced numerous accusations of antisemitism in recent years, and in 2018 adopted an international definition of antisemitism into its code of conduct.
"When we look at politics today, I think that's a key lesson we have to repeat - if people are doing things in your name, you have to call it out," Ms Pollock said.
"Distance yourseld strongly, robustly, clearly and constantly. And if you don't, you end up being complicit."
She added: "When we're teaching young people about the history of the Holocaust we're trying to draw out one of the lessons, one of them is not to be a bystander."