The Valmiki are right at the bottom of India's caste system. These men and women are part of a caste deemed 'Untouchable', and it is their lot in life to clean public toilets by hand. The Valmiki live apart from society because of their status as lower-class citizens, but there are some Indians fighting for the rights of this group.
For our latest Observers Direct, our journalist Derek Thomson went to meet these people and learn about the way they live.
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