Piers Corbyn was arrested in February after leaflets were handed out which appeared to compare vaccines to the Holocaust.
Police had been urged to investigate the leaflets after they were posted through letterboxes in Southwark and Lambeth.
Seventy-three-year-old Corbyn, the elder brother of former Labour leader, Jeremy, denied that the leaflets – which mocked up Auschwitz’s gates with the slogan ‘Vaccines are safe path to freedom’ – were antisemitic.
He said: “The idea we’re antisemitic in any way is completely absurd.
“I was married for 22 years to a Jewess and obviously her mother’s forebears fled the Baltic states just before the war because of Hitler or the Nazis in general.”
Piers Corbyn: anti-lockdown campaigner ‘doesn’t care’ about latest police investigation
By the summer the Walworth anti-vaccine and anti-lockdown campaigner was being investigated again by police for peeling off stickers telling people to wear masks from Tube trains. He even stood for the Mayor of London on an anti-lockdown, anti-low traffic neighbourhood platform, coming eleventh out of twenty candidates and gaining 0.8 per cent of the vote.