Rahul Gandhi called up N Rajan, father of the sisters and leader of Indian National Trade Union Congress, and Akhila, one of the two sisters who was put behind bars for allegedly attacking a CPI(M) worker.
The issue was brought to the notice of Gandhi by Opposition Leader Ramesh Chennithala.
Gandhi expressed shock over the arrest of the two sisters, who were released on bail last evening.
He also enquired about Anjana, Akhila's sister, who had allegedly attempted suicide and is now in hospital, Chennithala said in a release.
They were released yesterday.
The National Commission for Scheduled Castes Chairman P L Punia had stated that it would intervene in the matter and take steps to ensure that justice was meted out to them.