A bug in Facebooks moderation application was discovered in 2016 and caused the personal profiles of content moderators to appear among activity notifications for online groups after moderators had removed the groups administrators for terms-of-service violations. The personal details of Facebook moderators were then viewable to the remaining admins of the group. Over 1,000 Facebook employees were from special counter-terrorism unit in Dublin, Ireland. Six of those were assessed to be high priority victims of the mistake.”]
Source: https://securityaffairs.co/wordpress/60213/terrorism/facebook-revealed-moderators-terrorists.html