Commemorations of 45 people ‘experimentally’ gassed reveal dark moments in the Netherlands’ history

They call them stumbling stones – little brass plaques in the pavement marking addresses where Holocaust victims once lived.

As the Netherlands marks 80 years of liberation, a row has sprung up about placing Stolpersteine for 45 Dutch political prisoners – Jewish activists, communists, critical Christians – who were “experimentally” gassed by the Nazis at the Bernburg psychiatric clinic in Germany in 1942.