The so-called "hidden front" work is to go deep into enemy countries or enemy-occupied areas or the military and political departments of the enemy to collect, identify, sort out, analyze and transmit useful information in political, military, economic, cultural and social aspects.
In addition, the work of "hidden front" is very important for us to know and master the enemy's dynamics in time, disintegrate the enemy's morale and carry out other forms of struggle against the enemy.