What were the bad guys called in the original battlestar galactica?

The Bad Guys in the 1978 TV series Battlestar Galactica were called the Cylons. The humans of the Twelve Colonies in a distant galaxy had been at war with the Cylons for a millenium, but on the eve of a ceremony to end the hostilities the Cylons made a sneak attack destroying almost the entire human war fleet and Twelve colonies.