"They reflect a mental sickness which has crept in society...a strong law is not sufficient, they need a shock treatment... They should be hanged to send a strong message to other people," the Bharatiya Janata Party leader told reporters here.

Stating that the stronger anti-rape law passed by the parliament recently was not sufficient to deal with people accused of rape, Sushma Swaraj suggested Home Minister Sushilkumar Shinde should immediately call a meeting of political parties to discuss two changes needed in the law.