Russians Rally for Slain Opposition Leader

People carry a huge banner reading "Those bullets for everyone of us, heroes never die!" as they march in memory of opposition leader Boris Nemtsov who was gunned down on Friday near the Kremlin, in Moscow, Russia, March 1, 2015.

People carry portraits of opposition leader Boris Nemtsov, who was gunned down on Friday near the Kremlin, with words reading "He fought for a free of Russia, He fought for our future!" in Moscow, Russia, March 1, 2015.

The Russian national flag is pictured during a march to commemorate Kremlin critic Boris Nemtsov, who was shot dead on Friday, in Moscow, March 1, 2015.

Riot police stand guard during a march by opposition supporters to commemorate Kremlin critic Boris Nemtsov, who was shot dead on Friday night, in Moscow, March 1, 2015.

Flowers and pesters reading "Propaganda kills! Fight!" are seen at the place where Boris Nemtsov was gunned down on Friday near the Kremlin, with St. Basil Cathedral is in the background, in Moscow, Russia, March 1, 2015.

People carry Russian national flags as they march with posters reading "I have no fear, fight!" near the place opposition leader Boris Nemtsov was gunned down on Friday, near the Kremlin, in Moscow, Russia, March 1, 2015.

Opposition leader and Russia's former Prime Minister Mikhail Kasyanov, right, speaks to the media with opposition activist Ilya Yashin, left, during a march to commemorate Kremlin critic Boris Nemtsov, who was shot dead Friday, in Moscow, March 1, 2015.

Dmitry Gudkov, a member of the Russian parliament, attends a march to commemorate Kremlin critic Boris Nemtsov, who was shot dead Friday, in Moscow, March 1, 2015.