In response to Amnesty International's declaration of Free Pussy Riot Global Day, Chicagoans are expected to rally outside City Hall on the same day three members of the Russian feminist art collective were found guilty and sentenced to two years in prison each for "hooliganism."

Organizers of the rally, to be held from 4:30-6:30 p.m., are urging local supporters to "bring a brightly colored balaclava" -- or ski mask -- out of support for Nadezhda Tolokonnikova, Maria Alyokhina and Yekaterina Samutsevich.

The women -- aged 22, 24 and 30 -- were arrested in March after performing a "punk prayer" in opposition to Vladimir Putin, who was re-elected as Russia's president two weeks later. The have been jailed since their arrest.

Their incarceration sparked global outrage as a myriad of prominent musicians including Paul McCartney, Madonna, Peaches and Bjork called for the group to be freed.

Other demonstrations against the Pussy Riot members' sentencing are expected to be held in dozens of cities around the world Friday, including a protest outside the Russian consulate in New York City.

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  • From left, Yekaterina Samutsevich, Nadezhda Tolokonnikova, Maria Alekhina, members of feminist punk group Pussy Riot sit behind bars at a court room in Moscow, Russia, Friday, July 20, 2012. (AP Photo/Misha Japaridze)

  • Yekaterina Samutsevich, right, a member of feminist punk group Pussy Riot is excorted to a court room in Moscow, Russia, Friday, July 20, 2012. (AP Photo/Misha Japaridze)

  • Nadezhda Tolokonnikova, right, and Maria Alekhina, background center, members of feminist punk group Pussy Riot are excorted to a court room in Moscow, Russia, Friday, July 20, 2012. (AP Photo/Misha Japaridze)

  • From left, Yekaterina Samutsevich, Nadezhda Tolokonnikova, Maria Alekhina, members of feminist punk group Pussy Riot sit behind bars at a court room in Moscow, Russia, Friday, July 20, 2012. (AP Photo/Misha Japaridze)

  • Nadezhda Tolokonnikova, center, a member of feminist punk group Pussy Riot is escorted to a court room in Moscow, Russia, Friday, July 20, 2012. (AP Photo/Misha Japaridze)

  • In this Feb. 21, 2012 file photo, members of the Russian radical feminist group Pussy Riot try to perform at the Christ the Saviour Cathedral in Moscow. (AP Photo/Misha Japaridze)