This should be upvoted more, as the "Chairman" is "Justice Markandey Katju" whose legal opinion in this matter is credible. Not only does he say that the arrests are against freedom of speech which is "a guaranteed fundamental right", he says that the arrests are criminal according to law too.
Quoting the full paragraph here -
In the letter addressed to Chavan, Justice Katju has written: "It is alleged that she has been arrested for allegedly hurting religious sentiments. To my mind it is absurd to say that protesting against a bandh hurts religious sentiments. Under Article 19(1)(a) of our Constitution, freedom of speech is a guaranteed fundamental right. We are living in a democracy, not a fascist dictatorship. In fact this arrest itself appears to be a criminal act since under sections 341 and 342 it is a crime to wrongfully arrest or wrongfully confine someone who has committed no crime.