CC Madhya 17.53
bhilla-prāya loka tāhāṅ parama-pāṣaṇḍa
When Śrī Caitanya Mahāprabhu came to Jhārikhaṇḍa on His way to Mathurā, He found that the people there were almost uncivilized and were devoid of God consciousness.
The word bhilla refers to a class of men belonging to the Bheels. The Bheels are like Black Africans, and they are lower than śūdras. Such people generally live in the jungle, and Śrī Caitanya Mahāprabhu had to meet them.