Eugene Yu, the CEO of Michigan-based election software company Konnech, was criminally charged for allegedly storing Los Angeles election worker data on Chinese servers.

Los Angeles County prosecutor Eric Neff alleges that the amount of data involved in the breach was “astounding,” adding that “this is probably the largest data breach in United States history.”

The prosecutor’s complaint reads:

“Based on evidence recovered from a search warrant executed October 4, 2022, the District Attorney’s Office discovered that Konnech employees known and unknown sent personal identifying information of Los Angeles County election workers to third-party software developers who assisted with creating and fixing Konnech’s internal ‘PollChief’ software.”