Definition: In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.
Input: Passage: In the worst repressions of the Soviet period the label "foreign agents" was used to denounce dissidents - or simply political rivals of Joseph Stalin - and could lead to execution. Memorial says inspectors returned to its Moscow offices on Friday, having already seized 600 documents including accounts on Thursday.

used