Hostile Alien Lifeforms
From Contact Report 1
33. So there are species that have acquired much knowledge and have freed themselves from their environment; they travel through space and also occasionally come to Earth.
34. Many of them are rather unpleasant creatures and live in a certain barbarism that frequently is nearly as bad as the terrestrials'.
35. One must be on one's guard from them because they often attack and destroy everything that gets in their way.
36. Often they have destroyed whole planets or forced their inhabitants into barbaric slavery.
37. This is one of our tasks:
38. To warn the people on Earth of these creatures.
39. Let the people know this because the time is approaching when a conflict with these degenerate human creatures becomes unavoidable.