Do you know they're out?

Karla Homolka was one half of the murderous couple that haunted the people of Canada. Homolka, along with her psychotic husband Paul Bernardo, raped and murdered multiple women, including her own sister. When the couple was discovered in 1993, Homolka turned over evidence on her husband in exchange for a reduced sentence. She was released in 2005 after serving only 12 years in prison.

As one of the scariest serial killers in human history, Pedro Lopez was responsible for the rape and murder of hundreds of women in Columbia, Eduador, and Peru. He was caught in 1980 but only served 14 years in an Ecuadorian prison. Once he was released, he spent three years in a mental hospital in Colombia. He was declared sane in 1998 and released on $50 bail. Lopez is currently free and suspected of further murders in Colombia.

When Mary Bell was just 11 years old, she had already killed two young boys in separate incidents by strangling them and mutilating one with scissors. She was convicted of manslaughter in 1968. Twelve years later, when she was age 23, Bell was freed and able to change her name to start a new life. She won a court order that permanently protects her identity and that of her daughter – a protection for convicts now known as a "Mary Bell order." According to reports as recently as 2009, Bell had become a grandmother. 

In South Africa, Louis Van Schoor killed at least seven men who he claimed were burglars. After each murder, he'd be cleared by officials without so much as a caution. However, he was finally discovered in 1992. After serving only 12 years for the crimes, he was released in 2004.

Cannibal killer Nikolai Dzhumagaliev murdered and ate the remains of at least seven women (with the number probably closer to 50) in the Soviet Union. He was often known as the Metal Fang since he replaced his own teeth with white, metal teeth. He was caught in 1980, escaped in 1989, was recaptured, and then released after 10 years of psychological evaluation. 

Swedish serial killer Nikita Fouganthine (born Jua Veikko Valjakkala) killed three people in 1988. He was caught soon after and convicted of the crimes. Although he received a life sentence in a Finnish prison, he escaped in 1994. During his brief time of freedom, he held a teacher hostage but was soon caught afterwards. He escaped and caught again three more times in 2002, 2004, and 2006. In 2011, Fouganthine escaped from prison, and he has been on the lam ever since.

Italian serial killer Bartolomeo Gagliano was responsible for the death of at least three prostitutes in the late 80s. He was sentenced to eight years in a criminal asylum before the deaths of two of his victims, but he broke out with a fellow inmate in time to kill two prostitutes on Valentine's Day 1989. He said he was targeting people who spread the HIV virus. In December 2013, Gagliano escaped prison again in Genoa, Italy, and is allegedly armed and dangerous.

Norwegian serial killer Arnfinn Nesset worked as a nurse when he killed 22 people and attempted to kill more. Throughout the 80s, Nesset poisoned his patients with a muscle relaxer. In Norwegian law, the maximum time for a prisoner was 21 years; however, he only served 12 years of his sentence. He was released under parole terms, which have since expired. He is currently living under an assumed name in Norway. 

The Lainz Angels of Death, also known as Maria Gruber, Irene Leidolf, Stephanija Mayer, and Waltraud Wagner, were a group of Austrian nurses who murdered their patients. In most cases, they gave them purposeful overdoses of morphine, or forced water into their lungs. The exact number of people that they killed in Lainz, Vienna, between the years of 1983 and 1989 is unknown, although they confessed to 49 of them. Wagner and Leidolf received life sentences at their 1991 trials, while Mayer and Gruber were given lighter sentences on charges of manslaughter and attempted murder. As of 2008, all have been released from prison and are living under assumed names. 

Aleksandr Rubel killed 6 people in Estonia between November 1997 and June 1998. His methods of attack varied, but most of his victims were stabbed, beheaded, or had their throats slashed. Rubel was a minor at the time of his crimes, so he received a mandatory sentence of 8 years. He was released on June 8, 2006, and now reportedly lives in the Ukraine. 

Mika Muranen killed three people over a three-day period in 1994. His first victims were his Kotka, Findland-based neighbors, Reino and Sirkka Vulkko. He shot them with arrows fired from a crossbow. Two days later, on April 19, 1994, he used an assault rifle to kill a local mailman, Matti Olli. This led to an epic shootout with police that ended with Muranen's incarceration. He served 20 years in prison, and was release in 2014. He remains in Finland.

Wolfgang Abel and Marco Furlan killed at least 7 people in a violent spree that began in August, 1977 and ended in March, 1984. They called themselves "Ludwig," used the a symbol that was a combination of a swastika and a Nazi eagle, and traveled around Italy doling out their own twisted form of justice. The two were caught in March, 1984, and were sentenced to 30 years in prison in 1987. Furlan was released in 2009, while Abel was freed in 2013. 

Charlene Gallego, alongside her husband Gerald, raped and killed ten women, most of whom were teenagers. They were active killers in Sacramento, California, between the years of 1978 and 1980. Both were captured in 1984, and went to trial shortly thereafter. Charlene testified against her husband in exchange for a lighter sentence of 16 years and 8 months in prison. Gerald received a death sentence, and he died in prison in 2002. Charlene was released from prison on time, moved to the Fair Oaks, California area, and reportedly changed her name.

Mitchell Johnson and Andrew Golden are not traditional serial killers - instead, they are school shooters. In fact, they are the only school shooters in the United States who are not currently in prison. In 1998, they brought guns with them to Westside Middle School in Jonesboro, Arkansas. They killed four students and one teacher, and wounded ten other people. Since they were minors at the time - Johnson, 14 and Golden, 12 - they were only imprisoned until they were 18. Johnson has been in legal trouble since his release, but is no longer in prison for those additional crimes. 

Genene Jones technically hasn't been freed yet, but she is scheduled to walk out of prison as a free woman in 2018, thanks to Texas laws designed to prevent inmate overcrowding. Jones committed her crimes and was sentenced prior to 1987, so she falls within a legal loophole that lets her good behavior credit drastically reduce her sentence. Her crimes? She gave children under her care (she was a pediatric nurse) purposeful overdoses, killing many of them - although she was only charged with the deaths of two.