The committed no crimes. They were imprisoned in Tartarus because their father, Ouranos, didn't like their monstrous appearance.
Briareos Hecatonchires was created in 1985.
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Tartarus.
The Cyclopes, Hecatonchires, and Titans have all lived in Tartarus. The Cyclopes and Hecatonchires were banished there by Cronus. Cronus and other Titans were imprisoned there by Zeus.
He can do one hundred karate chops
200 arms and 200 heads
When they were born, he thought they were hideos creatures and wanted nothing to do with them.
The giant children of Uranus and Gaea were the Hecatonchires.
Gaia's Hecatonchires (or Hekatonkheires) were Cottus, Briareos and Gyges.
The Hecatonchires (hundred-handed sons of Gaia) and the Cyclopes made them in return for being released from Tartarus.
They made the Titans (Cronus, Oceanus etc),three Hecatonchires, Cyclopses and Echidna the mother of all monsters.
Cronus didn't hide any children. It was his father, Uranus, who hid Cronus' brothers, Hecatonchires and Cyclopes.