A Russian court has sentenced veteran opposition activist Sergei Udaltsov to six years in prison for justifying terrorism. Udaltsov, leader of the Left Front movement and a critic of President Putin, was convicted over an online article supporting other activists accused of forming a terrorist organization. He denies the charges, calling the verdict "shameful" and beginning a hunger strike. The sentence is to be served in a maximum-security penal colony. This comes amid a broader crackdown on dissent in Russia.