Thugs were orgnized gangs of professional assasins who travelled in groups across India fro several hundred years.
The thugs would join travellers and gain their confidense. This would allow them to then surprise and strangle their victims by tossing a handkerchief or noose around their necks. The killings were performed in honor of the goddess Kali and were very ritualistic.
This might interest Thug4Lyfe, where is he nowadays?