In the first five decades of the 20th century, the number of serial killers in the U.S. remained at a very low level. But between the 1950s and 1960s, the number of serial killers tripled. Between the 1960s and 1970s, they tripled again. In the 1980s and 1990s, they kept rising. And then, just as suddenly as the serial killer emerged as an American phenomeno ... Show More
