He also alleged that bodily harm has also been inflicted on them by Congress workers.
Raising the issue during the Zero hour, Shettar said such incidents after winning the elections is "not correct".
"I have come to know that about 25 families belonging to Nayaka community have been socially boycotted, shops are also not entertaining them, they are unable to lead their lives," he said.
Replying on behalf of the government, Industries Minister R V Deshpande said if such an incident of social boycott has happened, "we strongly condemn it."
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"The government will get things inquired and if such anincident has happened we will take action and provide protection to the affected families," he said.
Congress' Geetha Mahadev Prasad won the Gundlupete assembly seat for which bypolls were held on April 9.The seat fell vacant following the death of Mahadev Prasad, who was cooperative minister in the Siddaramaiah cabinet.