“Let us not forget, however, that for the Roman religion, conceived as a rigid state religion, the unbridled nature of a cult like that of Dionysus was considered dangerous. Arriving from Campania, the Dionysian cult spread rapidly to Rome, where the famous scandal of the Bacchanalia broke out and the devotees were deemed dangerous for the stability of the res publica itself.

In 186 BC a famous senatus consultum prohibited the cult of the god and prosecuted transgressors. Numerous places of worship were destroyed and even death sentences followed. In Pompeii, a sanctuary dedicated to the god and dating back to the middle of the third century BC remained in operation until the end of the city, in 79 AD and Pompeii always showed a fervent and growing devotion to the mysterious manifestations of the god.”

https://www.classicult.it/pompei-una-megalografia-dionisiaca...

And more from Wikipedia on the cult and its violent suppression—nearly 7000 killed.

https://en.wikipedia.org/wiki/Bacchanalia