Frieza

Saiyan Survival Saga
Frieza is the second born of King Cold and the Emperor of his half of the universe. Frieza is the leader and founder of his Frieza Force and Planet Trade System. Frieza is the one who recruited the Saiyans and after hearing about the legend of the Super Saiyan destroyed Planet Vegeta, and killed King Vegeta personally. After the planet was destroyed Frieza kept the three remaining Saiyans under his thumb to make sure they didn't cause any trouble.