Markus Schreiber, AP
Performing on Aug. 9, Madonna stripped down to black bra and revealed the words "No fear!" scrawled across her back. She then urged fans to wave the pink wristbands they'd been given at the door as a show of support for gay rights.
"If you are with me, I wanna see your pink armband," Madonna said. "If you are with me, raise your arm and show your love and appreciation for the gay community. Are you with me?"
Among those not with her: the 10 members of the Union of Russian Citizens, New Great Russia party and People's Assembly who banded together to file the suit.
"We demand that she pay for moral damage suffered by St Petersburg residents as a result of her actions during the show on August 9," a spokeswoman for the Union of Russian Citizens said in a statement. "We must defend our right to normal cultural life without propaganda of values and views that contradict the Russian culture."
Anti-gay crusaders weren't the only Russian conservatives ticked off during Madonna's recent visit. The Queen of Pop also drew flack for throwing her support behind Pussy Riot, the female punk group that was then on trial for -- and subsequently convicted of -- speaking out against President Vladamir Putin.
Of course, Madge's troubles aren't limited to Russia. The St. Petersburg brouhaha comes roughly a month after France's far-right National Front party vowed to sue the singer over a concert video featuring a swastika superimposed on leader Marine Le Pen's forehead.