Associated with the revolutionary circle in Kyiv, where she worked with Anna Kuliscioff, Leo Deutsch and Yakov Stefanovich, she was arrested and exiled to Siberia for her activities.

Suspected of being involved in a criminal association, Krukovska was kept under surveillance by Kyiv provincial police, but after a year they found no evidence and terminated their investigation of her.

[2] Krukovska then made contact with the revolutionary circle around Leo Deutsch and Yakov Stefanovich, helping run their clandestine printing operations in Kyiv.

[3] Together with Deutsch and Stefanovich, on 8 July 1879, she was found guilty of destroying evidence of their clandestine printing operations and sentenced to three and a half years of exile in Irkutsk.

[5] She was buried in Mglin, where her epitaph reads: "Lord, rest her soul in Your kingdom my dear sufferer Yulia, who fought for fraternity, equality, freedom and independence of all nations and estates without distinction of position and condition.