Above is John George Haigh. He was a serial killer who killed people who trusted him and embezzled their money by means of sulphuric acid. Haigh's known victims were direct victims of his cons, and were all killed to silence them. He took his time to build a relationship with them and then lured them to his workshop with a trick and then killed them there.

John George Haigh was born in 1909 and raised in a very religious household. His parents, Emily and John Haigh, were both members of the Plyemouth Brethren, a Christian sect. His father had a mark on his forehead and when John asked about it he replied that God put it on his head as punishment for a past sin and often told him he too would get one if he committed a sin. When John did commit sins and petty thefts and was not marked, he realized that it was possible to commit crimes and go unpunished.

He is know for saying "When I discovered there were easier ways of making a living than to work long hours in an office, I did not ask myself whether I was doing right or wrong. That seemed to me to be irrelevant. I merely said, 'This is what I wish to do'. And as the means lay within my power, that was what I decided." Haigh made friends with his victims and then killed them in his workplace, afterwards he dumped their bodies in a vault full of sulphuric acid. He was hung on August 10, 1949.

Safety tips

• Do not entrust anyone with your money or let them know your personal business.
• Do not go to places you don't know about, no matter who you're with.