Do the Sith identify young potentials?

The Jedi Council identifies young potentials in the Republic systems, and recruit them for training...

Qui-Gon: Had he been born in the Republic, we would have identified him early...

How about the Sith? Do they just focus in converting existing Jedi to the Dark Side, or is there any occurence of a Sith finding a young potential and taking him as an apprentice?