1) Zodiac killer- Zodiac killer was a serial killer who lived around the late 1960s and early 1970s in northern California. The Zodiac killer killed in San Francisco and many other places in USA. No one knows if the Zodiac Killer is alive or dead. The Zodiac killer targeted 3 women between the ages of 16 and 29. The Zodiac killer sent horrible letters to the newspaper press around their place. The Zodiac killer was known for its sign in his letters. The Zodiac killers identity was unknown but some people were suspected.
Acknowledgement for picture above- http://coldcasesquad.blogspot.co.nz/2012/08/the-zodiac-killer-ultimate-cold-case.html
2) James Whitey Bulger- James Whitey Bulger was a murderer. He killed 19 people and organized crimes to happen. Bulger was arrested on 2011 at the age of 81.Bulger was USA's most wanted gangster. In 1956 he ws in prison for armed robbery. Bulger was also a drug dealer.
Acknowledgement for the picture above- http://en.wikipedia.org/wiki/Whitey_Bulger
3) Semion Mogilevich- Semion Moglievich is known to be the boss of bosses in which some people say. He has done many bad things like contracting murders, line frauding, weapon trafficking and many other things. Semion Mogilevich is recognized by the FBI's as the most dangerous mobster in the world.
Acknowledgement for the picture above- http://www.dailystormer.com/vast-criminal-empire-russian-jewish-mob-boss-semion-mogilevich/
4) Jim 'Killer' Miller was known to be the American outlaw and assassin of the American old West. He did 12 kills during gunfights. It was maybe the most of his time. Miller was referred to be Methodist because he regularly attended the Methodist Church and he did not smoke or drink. Miller was around in the late 1800's and early 1900's.
Acknowledgement for the picture above- http://www.legendsofamerica.com/we-jamesmiller.html