What do communists say about migration?

Every day the news in the Western world is full of stories about migration. Major political parties are forming their messaging around anti-migrant rhetoric. At the same time, the left is organising protests and holding signs which say 'refugees are welcome here'. But migration didn't come out nowhere, it is a product of capitalisms need for cheap labour and foreign wars. So what is the communist position on this question? At Revolution Festival last year, Fiona Lali from the RCP Executive Committee talked on this topic.