It is special counsel Robert S. Mueller III whose work seems to be sending shock waves through the capital, by exposing the lucrative work lobbyists from both parties engage in on behalf of foreign interests.

The Mueller probe has already claimed its first K Street casualty: Tony Podesta. His lobbying firm, the Podesta Group, a Washington icon of power and political influence, notified its employees recently that the enterprise is shutting its doors.

Since Mueller was appointed, more people and firms have either filed or amended registrations that make public their work on behalf of foreign interests than had done so over the same time period in each of at least the past 20 years. Lobbyists, lawyers and public relations professionals who work for foreign companies and governments say Mueller’s probe has spooked K Street, and firms are likely to be more careful in their compliance with public disclosure standards.