Left wing activists shout slogans during a rally marking May Day in Kiev, Ukraine, Sunday, May 1, 2011. The sign reads " Down with hired labour." (AP Photo/Sergei Chuzavkov)

Left wing activist,wears a scarf with the image of Argentinian Revolutionary leader Che Guvara, during a rally marking May Day in Kiev, Ukraine, Sunday, May 1, 2011. (AP Photo/Sergei Chuzavkov)

A Communist supporter holds a portrait of the Soviet founder Vladimir Lenin, during a traditional demonstration in May Day in Kiev, Ukraine, Sunday, May 1, 2011. (AP Photo/Sergei Chuzavkov)

PHOTO; EAST NEWS/AFP A picture of Vladimir Lenin is seen among red flags during a May Day rally in central Moscow, 01 May 2007. Thousands of people across Russia called for higher salaries and pensions Tuesday in May Day demonstrations that carefully avoided criticism of the Kremlin. AFP PHOTO / NATALIA KOLESNIKOVA SWIETO PRACY, MOSKWA 2007

PHOTO; EAST NEWS/AFP An supporter of Communist party holds a Communist symbol in front of the monument of Vladimir Ilyich Ulyanov Lenin, a Russian revolutionary, a communist politician, the main leader of the October Revolution, the first head of the Soviet Union, during a mass May Day march in the center of Kiev 01 May 2007. AFP PHOTO/GENIA SAVILOV SWIETO PRACY W KIJOWIE, 2007

Communists and their supporters celebrate May Day in downtown Kiev, Ukraine , Sunday, May 1, 2005. Some 2,500 Ukrainian Communists and supporters marked May Day on Sunday, rallying in downtown Kiev to protest the pro-Western policies of the current government. (AP Photo /Sergei Chuzavkov)

PHOTO: EAST NEWS/WOJTEK LASKI Russian nationalist bolsheviks gesture during a rally in the center of Moscow, May 1, 2002. Thousands of Communists marched in the streets of Russian capital on Wednesday to celebrate the May Day. SWIETO PRACY, MOSKWA 2002

PHOTO: EAST NEWS/WOJTEK LASKI Russian nationalist bolsheviks gesture during a rally in the center of Moscow, May 1, 2002. Thousands of Communists marched in the streets of Russian capital on Wednesday to celebrate the May Day. Anti-Israil demonstration on the 1th May,2002, On the poster:"Israil is out of low". SWIETO PRACY, MOSKWA 2002

A demonstrator wearing traditional Cossack costume with Soviet war medals attached and a dagger in his belt attends a Communist rally on Friday, May 1, 1992 in Moscow's October Square. Anti-reform protests were staged in the streets of Moscow on the first May day in Post-Communist Russia. The government did not sponsor worker's parades as in the past, but instead declared the day a celebration of spring and labor. (AP Photo/Peter Dejong)

PHOTO:EAST NEWS/WOJTEK LASKI OBCHODY 1 MAJOWE W MOSKWIE, GORBACZOW Z LEWEJ ROSJA 1989

PHOTO:EAST NEWS/WOJTEK LASKI OBCHODY 1 MAJOWE W MOSKWIE ROSJA 1989

Nuclear missiles are paraded through Red Square in Moscow, Russia, during the Military May Day parade, May 1, 1988. (AP Photo/Boris Yurchenko)

Thousands of Soviet citizens crowd the Red Square, Moscow, Russia, May 1, 1983, during the annual workers parade carrying giant posters criticizing the U.S. nuclear arms policies. (AP Photo/Boris Yurchenko)

Thousands of Soviet citizens crowd the Red Square, Moscow, Russia, May 1,1983, during the annual workers parade carrying giant posters criticizing the U.S. nuclear arms policies. (AP Photo/Boris Yurchenko)

Top Soviet dignitaries wave from the Lenin Mausoleum, from left to right, two military leaders, Andropov, Tikhonov (Premier), Grishin, greeting the thousands of Soviet citizens crowding the Red Square, Moscow, Russia, May 1, 1983, during the annual workers parade carrying giant posters criticizing the U.S. nuclear arms policies. Soviet Party, State and Military leaders standing on the rostrum are from left to right: Epishev, Kulikov, Ogarkov, Ustinov (Defense Minister) Andropov, Tikhonov (Premier), Grishin, Gromyko (foreign minister), Gorbachyov and Aliev. (AP Photo/Boris Yurchenko)

Thousands of Soviet citizens crowd the Red Square, Moscow, Russia, May 1,1983, during the annual workers parade carrying giant posters criticizing the U.S. nuclear arms policies. (AP Photo/Boris Yurchenko)

Top Soviet dignitaries wave from the Lenin Mausoleum, greeting the thousands of Soviet citizens crowding the Red Square, Moscow, Russia, May 1, 1983, during the annual workers parade carrying giant posters criticizing the U.S. nuclear arms policies. (AP Photo/Boris Yurchenko)

Top Soviet dignitaries wave from the Lenin Mausoleum, greeting the thousands of Soviet citizens crowding the Red Square, Moscow, Russia, May 1, 1983, during the annual workers parade carrying giant posters criticizing the U.S. nuclear arms policies. Soviet Party, State and Military leaders standing on the rostrum are from left to right: Epishev, Kulikov, Ogarkov, Ustinov (Defense Minister) Andropov, Tikhonov (Premier), Grishin, Gromyko (foreign minister), Gorbachyov and Aliev. (AP Photo/Boris Yurchenko)

Thousands of Soviet citizens crowd the Red Square, Moscow, Russia, May 1, 1983, during the annual workers parade carrying giant posters criticizing the U.S. nuclear arms policies. (AP Photo/Boris Yurchenko)

Missiles are paraded through Red Square in Moscow, Russia, during the May Day parade, May 1, 1968. (AP Photo)