The government was worried about the activities of the fifth column.
Правительство беспокоилось о деятельности пятой колонны.
Definitions
A fifth column refers to a group of people who secretly undermine a larger group, such as a nation or organization, from within. The term originated during the Spanish Civil War, where it was used to describe supporters of the enemy who were working to sabotage efforts from inside the city.
