After completing an anonymous 360 evaluation in our company, our boss received a score 2.5/5 as an average of 8 evaluations. He gathered all 8 of us in his office, demanding to speak up and support the negative review of each of the factors, not knowing which ones have ranked him with 1/5 and which on with 5/5. Not getting what he asked for, since what was the point of an anonymous evaluation after all, he threatened us that our time is up and he will now be a different person to all of us and anyone that does not follow his orders, will be out. I am mainly wondering if his initiative to have us all present in a room and demanding to know who were the "bad ones" is legal, or we have a right to report this behavior to HR at least. Thanks!
Just to answer to few of your questions: my country is Greece and his horizontal and top-down evaluation was also low (he has the lowest overall score among all management positions). The 360 evaluation was initiated by HR and no, I do not believe that the specific HR manager will act on it in our favor.