Madame Popova was a "murderer for hire" in Russia during the late nineteenth and early twentieth centuries. For a fee, she would "liberate" wives married to supposedly cruel husbands. Her murders began in 1879 and lasted until 1909, when the police were tipped off by a remorseful liberated woman and Popova was captured. During that time, she had killed over three hundred victims by various means, including poison, weapons, her own hands and even hired assassins. She was executed by firing squad.