NORTH HOLLYWOOD — Gathering Saturday afternoon at the Mayflower Club to start a city revolution, a group of local civic activists and business leaders, including former Mayor Richard Riordan, officially launched a grass-roots effort to "clean up City Hall."

L.A. Clean Sweep, co-founded by former Daily News Editor Ron Kaye, aims to sweep a slate of community-oriented candidates into city offices and replace incumbents the group derides as ineffective and indifferent to the public.