Actually, it was not hard for them to see that Albert did not fully trust everyone—or rather, that he doubted their ability to keep a secret. That much was obvious just from the way the house-elves transported them to the Defense Association's headquarters.
Of course, this also had an advantage: even if someone did leak the Association's secrets, they wouldn't have to worry about You-Know-Who and the Deathiers finding the headquarters.
Although this lack of trust made them feel somewhat uneasy, the students who had just graduated from Hogwarts all understood one thing: there are no secrets at Hogwarts.
Chapter 1144