Myanmar has been gripped by deepening religious tensions that have repeatedly spilled into violence, partially attributed to anti-Muslim rhetoric spread by nationalist groups like Ma Ba Tha.
The Sangha Maha Nayaka Committee, Myanmar's highest Buddhist authority, sent a letter to government ministries today.
"People, either as individuals or as a group, cannot take any actions under the name of Ma Ba Tha," said the letter, which was seen by AFP and carried the signature of several monks including senior figures from Ma Ba Tha.
But Ottama, a Ma Ba Tha monk in Yangon, said the group still planned to hold its annual meeting this weekend despite the ban.
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"The most certain thing is that we will hold the Ma Ba Tha conference on the 27 and 28 of this month," he told AFP.
The Sangha's sanction comes just weeks after the same committee, which represents the upper echelons of the clergy, banned the country's most notorious monk Wirathu from preaching for a year.
Religious tensions have soared since a group of Rohingya Muslims attacked police posts in the north of Rakhine state last October, sparking a bloody military crackdown that has drawn widespread international condemnation.
Since then nationalists in Yangon have held protests, stopped Islamic religious ceremonies and most recently forced two schools to shut their doors over accusations they were illegally doubling as mosques.
Police have arrested five people this month after a fight broke out in a Muslim neighbourhood of Yangon when dozens of hardliners raided a house believed to be hiding Rohingyas.