Bongal Kheda refers to an organised campaign of ethnic cleansing of the Bengalis in the North East, that originated in the Brahmaputra Valley of Assam during the 1960s and 1970s and spread to Meghalaya and Tripura in the 1980s. During its peak in 1960, around 50,000 Bengali were expelled from Assam, who took shelter in West Bengal.