(BIVN) – Hawaii Senator Mazie Hirono on Thursday had a chance to question a key witness at a Senate hearing on Russia meddling in U.S. elections and other alleged activity.

William Browder, the chief executive officer at London-based Hermitage Capital Management who characterizes himself as a target of Russian government-retaliation, spoke at length about Russia’s alleged ability to hack, tamper, and leverage matters in their own interest.

The questioning came during the second day of an Senate Judiciary Committee oversight hearing to examine the Foreign Agents Registration Act and attempts to influence United States elections, “focusing on lessons learned from current and prior Administrations.”

Browder’s written testimony offered an eye-opening account of alleged Russian corruption, the death of Sergei Magnitsky, and the subsequent attempt by Russia to have the Magnitsky Act repealed.

“I hope that my story will help you understand the methods of Russian operatives in Washington and how they use US enablers to achieve major foreign policy goals without disclosing those interests,” wrote Browder in his testimony. “I also hope that this story and others like it may lead to a change in the (Foreign Agent Registration Act) enforcement regime in the future.”