Great importance must be given to the promotion and protection of the human rights of persons belonging to groups which have been rendered vulnerable, including migrant workers, the elimination of all forms of discrimination against them, and the strengthening and more effective implementation of existing human rights instruments.

UNESCO: Vienna Declaration and Programme of Action

Actually, the thing that is most often the focus is the "current account balance", which means trade in goods and services plus some financial items, including remittances that migrant workers send home.

BBC: Currency war's key battlegrounds

The GLA aims to protect workers in the agricultural industries, including Lincolnshire where there is a concentration of migrant workers.

BBC: Paul Broadbent