The four evils refer to reverse osmosis, psychological warfare, policy and stealing secrets, which are the contents of the unremitting struggle of the hidden front. In the future war, infiltration and reverse osmosis, psychological warfare and anti-psychological warfare, rebellion and counter-rebellion, stealing secrets and anti-stealing secrets will certainly run through the whole process of military struggle. To lay a good foundation for carrying out the work of "four pests", first, we should clearly understand the situation and put the work of "four pests" in an important position.

Extended data:

Responsibilities of the military security department:

1. Lead the troops to implement the principles and policies of the party and the state in political and legal work, implement the policy of putting prevention first and comprehensive management, formulate and implement crime prevention measures, and organize crime prevention work.

2. Organize anti-traitor and anti-spy education and law-abiding education, carry out reverse osmosis, anti-psychological warfare, anti-spy and anti-theft struggles, and master the work of covert struggle.

3. Organize the security work of leading organs, key departments, sea and air defense lines and related frontier defense, and cooperate with relevant departments to do a good job in security alert for military exercises, important meetings, large gatherings and camps.

4, organize and lead the grass-roots safety work.

5. Organizing the investigation of criminal cases.