Is the excommunication of a Sikh authorized by Gurbani, Sikh Raht Maryada (it mentions a Sikh being declared tankhaiya , i.e. leading to social boycott), Sikh tradition or by the Shiromani Gurdwara Prabandhak Committee Act ?
SIKH REHT MARYADA states in Section SIX, Chapter XIII, Article XXV -...