What Sibboleth said. Xenophobia is a right-wing value. Openness and internationalism are left-wing values. Period.
1. Openness and internationalism are liberal/libertarian values as well, and socialists can be nationalist (most third world/ex colony socialists are).
2. You don't have to be xenophobic to be anti-immigration. There are plenty of economic and environmental reasons to be against mass immigration.
3. It doesn't make much sense to define right and left in other terms than socioeconomic ones.