FILE - In this Sept. 15, 2012 file photo, opposition leader Sergey Udaltsov speaks at a protest rally in Moscow. Investigators in Russia say that they are opening a criminal case against Udaltsov and several other opposition activists for their alleged role in plotting mass riots. The Investigative Committee said in a statement early Wednesday morning, Oct. 17, 2012 that the probe is held to check claims in a recent documentary aired by a Kremlin-friendly TV channel that opposition leaders worked with Georgian officials and a disgraced Russian banker to overthrow the government. (AP Photo/Mikhail Metzel, File)