Darkness at Noon by Arthur Koestler

Darkness at Noon by Arthur Koestler Reserch on the above topic and answer on one of the below topics, 1. What does koestler mean by the concept 'anti-vivisection morality'?Descripe the concept.Why was 'anti-vivisection morality 'incompatiple with stslinist Russia?On the hand, is vivisection morality a justifiable option for political system?why?or why not? 2. What does Koestle mean by the concept 'grammatical fiction'? Describe the concept.How does the  concept'grammatical fiction apply to stalinist soviet society? why was this image projected? Is the grammatical fiction a justifiable option for political system? Why? or Why not?. 3. According to Koestler. what were the differences between the aims of the original revolutionary party and the aim of the instituonalized revolutionary party? What was Rubashov's dilemma?