The Robin Hood Group and ETC
Following the attack on the DAO that occurred on June 17, 2016, a pseudo-anonymous group calling themselves the Robin Hood Group (RHG) launched on June 21, a white hat attack on the DAO to secure the remaining 7.2M ether that remained in the DAO.
via https://medium.com/@jackfru1t/the-robin-hood-group-and-etc-bdc6a0c111c3