Two former eBay Inc. employees pleaded guilty Thursday to their roles in a campaign to terrorize a publisher and editor of an online newsletter critical of the company with a scheme that included live spiders and other disturbing deliveries sent to their home. Stephanie Popp, former senior manager of global intelligence; and Veronica Zea, a former eBay contractor who worked as an intelligence analyst in eBay’s Global Intelligence Center, pleaded guilty to conspiracy to commit cyberstalking and conspiracy to tamper with witnesses. They are scheduled to be sentenced in February. They are among seven former eBay employees charged in the...