 |  | Murdoch opponent challenges UK regulator over Sky deal |  | LONDON (Reuters) - Activist group Avaaz stepped up its battle to stop Rupert Murdoch buying Sky , launching a legal challenge to the regulator's view that the pay-TV group would still be a "fit and proper" owner of a broadcasting license if the deal goes ahead. | |  | |  |  | |  |  | Related Video | |  | |  | |  |  |  | Related News | |  | |  | |  |  |  |  |  | Make sense of the market with highlights of valuable financial information and reports along with compelling investment insights. Register Today |  | |  |  |  | Get a jump on the day with our early morning summary of key news developments for the US markets, as well as global market news. Register Today |  | |  | » » MORE NEWSLETTERS |  | |