Anarchist/Socialist critiques of the immigration debate?

Hello all,

One of the most frustrating things for me about the immigration debate is that I feel it exposes the obvious contradiction at the heart of conservative politics. The consensus among economists seems to be that immigration helps the economy overall, and this is the one and only reason why European states have been pro-immigration since WW2. If you want to control immigration, then you need to support political parties that are for big government intervention in the economy. The problem is that conservative parties are almost always the most economically liberal free-market types. Ie: they want to stop immigration through government policy, but they also want free movement of labour and capital because they've been told by their economic advisors that it'll make the country richer.

So the politicians avoid this debate altogether, and everyone pretends that European countries have allowed immigration all these years because they're all bleeding heart liberals with blind faith in multiculturalism. This leads the angry conservative electorate to blame liberals and the concept of multiculturalism. I feel that the truth is that if economists had stated 50 years ago that immigration hurts the economy, there wouldn't be a single immigrant anywhere in Europe today.

Am I misreading the whole immigration debate? Can anyone recommend any good critiques of the debate from the left?

Cheers all