“Fifth columnists” refers to people within a country or group who secretly help the enemy from inside.
Firstly, beware of the fifth columnists among ourselves. Here “Fifth Columnists” means:
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the KPPSC – Khyber Pakhtunkhwa Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.