The influx of new arrivals here has made immigration a hot social issue and a key theme in the upcoming election. In last month’s inconclusive poll, the virulently anti-immigration Golden Dawn party swept into parliament for the first time in its history, promising to lay landmines along the border with Turkey. […] Last month, Golden Dawn members rounded on a derelict factory in Patras traditionally used by immigrants for shelter. They threw petrol bombs and set fire to parts of the building, clashing with riot police.