#1
If you support immigration for non-accelerationist reasons your not a radical

http://classicalmarxismvsimmigration.blogspot.com/

ENGELS TO AUGUST BEBEL
IN PLAUEN NEAR DRESDEN

London, 18 March 1886
Dear Bebel,


If China is opened up, not only will overproduction risk losing its
last safety-valve, but emigration from China will assume such massive
proportions that this alone will suffice to revolutionise conditions
of production throughout America, Australia and India, even to the
extent of affecting Europe — if it lasts itself till then.
#2
Woops, only meant to post once.
#3
The other thing to consider is that skilled immigration leads to brain drain that favors the First World.