Ashutosh Brahmachari, who accused Swami Avimukteshwaranand Saraswati of sexual exploitation, was attacked on a train in Prayagraj; police are investigating.
Avimukteshwarananda has been in the headlines for his confrontation with the organisers of the Magh Mela in Prayagraj.
The action was taken after a Prayagraj court directed that a case be registered on an application moved by Ashutosh Brahmachari Maharaj and others.
Swami Avimukteshwaranand Saraswati, accused of sexual abuse, has filed a case against his accuser under the POCSO Act, claiming the law allows action against false accusations. He has also sought anticipatory bail from the Allahabad High Court.
Tensions between Shankaracharya Swami Avimukteshwaranand Saraswati and the Uttar Pradesh government led by Chief Minister Yogi Adityanath have drawn national attention in recent months.