In 20 century when our constitution was establishing in 1950’s then many leaders like B.R.AMBEDKAR wanted to eradicate discrimination in society. they abolished begar  and untouchability in the society. to avoid discrimination of lower caste people they were also given a chance to take part in formation of constitution and in parliament. RESERVATION’S system was introduced. S.C & S.T’s   and other lower castes were given reservations in universities  , government jobs ,etc. these ideas helped to eradicate discrimination in society.