Clinton Foundation Said to Be Breached by Russian Hackers

The Bill, Hillary and Chelsea Clinton Foundation was among the organizations breached by suspected Russian hackers in a dragnet of the U.S. political apparatus ahead of the November election, according to three people familiar with the matter.

The attacks on the foundation’s network, as well as those of the Democratic Party and Hillary Clinton’s presidential campaign, compound concerns about her digital security even as the Federal Bureau of Investigation continues to investigate her use of a personal e-mail server while she was secretary of state.

Clinton Foundation officials said the organization hadn’t been notified of the breach and declined to ...