Chief Judicial Magistrate S P Singh gave the direction to Muzaffarpur district police chief Rajesh Kumar on a petition filed by an advocate seeking action against them for their hate speeches.
A case was also filed in Gopalganj against Shiv Sena patriarch Bal Thackeray, Uddhav, party executive president, and Maharashtra Navanirman Sena chief Raj Thackeray accusing them of making provocative speeches.
Adam Ali, a journalist of Urdu daily "Quami Tanjeem' filed the case in the court of chief judicial magistrate Sanjay Kumar Sinha charging the Thackerays with making hate speechs against Biharis, saying it may disrupt peace and communal harmony and fuel regional sentments in the country.
He also said that Raj Thackeray's statements describing Bihari migrants as infiltrators amounted to a "brazen violation" of provisions of the Constitution that allows citizens to move freely and settle down in any part of the country.
Similar petitions have been filed against the Thackerays in Bhagalpur, Nalanda and West Champaran courts besides, in other districts of Bihar over the past few days.
The MNS chief had described the Bihari migrants as infiltators and threatened to drive them out of Mumbai and Mahashtra following the Bihar government's protest against the arrest of an accused in the Azad Maidan violence from his native Sitamarhi district by the Mumbai police without informing the local administration.
The Shiv Sena patriarch and his son Uddhav had also joined forces with the MNS chief and made comments to deride Bihari migrants. Udhav even demanded issuance of permits to Biharis to visit Mumbai and others parts of Maharashtra.