His other clients included the House of Commons journalist and later Conservative Member of Parliament Jonathan Aitken, who was charged in 1971 under the Official Secrets Act for passing classified information about the Biafra war to the weekly "The Sunday Telegraph". Wigoder successfully argued in his plea in favour of Aitken that it was his duty "to act in the interests of the state". This plea has since become a basis for similar processes. Over the years he has been a constant critic of the provisions of this law, which he considered illiberal and unfair.