Because they are largely invisible, these forms of child labour are the most difficult to tackle. Domestic workers, most of them girls, are isolated and subject to the whims and arbitrary discipline of their employers, from whom they may suffer abuse. Sexual abuse is frequent but seldom prosecuted. Violence or abuse at home or in the neighbourhood drives many away, as studies have shown in cities as diverse as Dhaka, Bangladesh, and Moscow, Russian Federation.67 Poverty also plays a part.