Modi said the Justice Ranganath Commission was used as an instrument to sow the seeds of poison.
Addressing a meeting here, the BJP's prime ministerial candidate sought to woo the Dalits and backwards saying there has been a "conspiracy" to snatch the rights given to the community by B R Ambedkar.
Modi also promised that after coming to power at the Centre, he would like to do something for his "family", pointing towards the crowd at a meeting of Dalit forum.
On a visit to Karnataka last week, UPA chairperson and Congress president Sonia Gandhi had launched an attack on the opposition BJP - accusing it of indulging in zeher ki kheti (sowing seeds of poison) to attain power.
Modi had hit out later saying it is Congress, not BJP, sowing seeds of poison.