The most sensitive part of the Pentagon Field Manual concerns the passage which describes how the “internal stabilisation operations” were to be carried out in practice, hence how the Pentagon advised the European military secret services to fight what the Pentagon perceived as the “communist” or “socialist” thread. In what seems to be a description of the operations which some stay-behind armies actually carried out during the cold war, namely terrorist attacks in public places which were thereafter wrongly blamed on the communists and socialists by planting false evidence, is described by FM 30-31B like that: "There may be times when Host Country Governments show passivity or indecision in the face of communist subversion and according to the interpretation of the US secret services do not react with sufficient effectiveness. Most often such situations come about when the revolutionaries temporarily renounce the use of force and thus hope to gain an advantage, as the leaders of the host country wrongly consider the situation to be secure. US army intelligence must have the means of launching special operations which will convince Host Country Governments and public opinion of the reality of the insurgent danger."