Aeschylus' Suppliant Women, lines 994-5:

My translation: But everyone has a bad word ready for the resident foreigner, to utter good-sounding abuse.

http://perseus.mpiwg-berlin.mpg.de/cgi-bin/ptext?lookup=Aesch.+Supp.+980

The word in question is metoikos, meaning immigrant, foreigner with resident rights. The LSJ does have the word 'alien' in its entry:

http://perseus.mpiwg-berlin.mpg.de/cgi-bin/ptext?doc=Perseus:text:1999.04.0057:entry=#67193

Bingley


Bingley