The lives of Russia's migrant workers have never been easy. But the year 2013 brought even greater challenges, with rising nationalism and a shaky economy making migrants the target of increased hostility and violence. The summer witnessed massive nationwide raids in which thousands of Central Asians, Caucasians, and other labor migrants were detained and sometimes deported. Migrants say their status leaves them vulnerable to extortion and abuse. Many Russians, meanwhile, have called for Moscow to impose a visa regime for visiting workers from the post-Soviet region. (20 PHOTOS)