WASHINGTON—William J. Ferry, a former stock broker and investment adviser, and Dennis J. Clinton, a former real estate investment manager, were found guilty by a federal jury in Santa Ana, California today for their roles in a conspiracy to defraud a wealthy investor of $1 billion in a high-yield investment fraud scheme, announced Assistant Attorney General Lanny A. Breuer of the Justice Department’s Criminal Division. The investor was, in reality, part of an undercover FBI team that posed as wealthy investors and investment managers in an effort to stop fraudsters before they actually harmed victims.