People don’t tend to think of Pussy Riot — the collective of feminist, anti-Putin activists — as artists. But that’s exactly what they are: Performance artists who use punk, poetry and situational agitprop as their tools. “Velvet Terrorism: Pussy Riot’s Russia,” a 10-year retrospective of Pussy Riot “actions,” which have taken place in Red Square, in a Russian Orthodox cathedral, at the Sochi Olympics, at the 2018 World Cup final and in Siberian penal colonies, opened at Kling & Bang in Reykjavik, Iceland, at the end of November. Noisy, scandalous, incredibly brave and, at times, poignantly poetic, it shows art at its most meaningfully political and free. — S.S.