The century's most prolific serial killer may have been a midwife in 1920s Hungary, the leader of a murder ring of women responsible for the deaths of at least 160 men. As Patti McCracken details here, "Auntie Suzy" distilled arsenic from flypaper and distributed it to the wives and mothers of Nagyrév. Over the course of 15 years, villagers solved their family problems with poison, but as McCracken also notes, justice eventually caught up with them.