Untouchables and watchtower shunning have many things in common

I'm not that familiar with Untouchables, but the Wikipedia lists.

Prohibition from eating with other members
Provision of separate cups in village tea stalls
Separate seating arrangements and utensils in restaurants
Segregation in seating and food arrangements in village functions and festivals
Prohibition from entering into village temples (This is diminishing these days)
Prohibition from wearing sandals or holding umbrellas in front of higher caste members
Prohibition from entering other caste homes
Prohibition from using common village path
Separate burial grounds
No access to village's common/public properties and resources (wells, ponds, temples, etc.)
Segregation (separate seating area) of children in schools
Bonded labour
Social boycotts by other castes for refusing to perform their "duties"

Several things on that list remind me of Watchtowers restrictions on associating with the Disfellowshipped.