"Proponents also point to the proclamations and claim that the Manu Smriti was propagated.". The reign of this traitor was between 185BCE to 151BCE. Dr. Ambedkar in "Who is Shuidra" acknowledges that deterioration (like no thread ceremony for girls, presecution of Ahudras) began sometime after 200BCE. Now I know that it is this traitor Pusyamitra is responsible.