After enslaved Africans successfully led the Haitian Revolution, there were growing fears about similar slave revolts in Brazil. The 1820s and 1830s saw increased police repression of African-derived religions in Brazil. Laws introduced in 1822 allowed police to shut down "batuques", or drumming ceremonies among the African population. It was during this period that the Engenho Velho ("Old Sugar Mill") terreiro was established; it was from this group that most Nagô terreiros descended. Various records indicated that Creoles and Whites were also sometimes taking part in the rites which the police were suppressing.