The images make the people looking darker than they are. Quite progressive average, students are on average really on a higher level. The dominance of Leptosomic constitution is obvious. I see Pontid-Atlantid/North Mediterranid, Nordid, Dinarid, Alpinid and Osteuropid influences, in that order. The guy with the beard looks darker and at the same time more pyknomorphic than the others. Pontid and Nordid are strongest me thinks. Probably Slovaks, Czechs, Hungarians...
They are Czech, from the stage-school in Brno, Moravia. Interesting guesses and comments. I am a little puzzled by Agrippas Pontids since this area is considered to be one of the most brachycephal in Europe. But that is of course not seen in pictures from the front.
My experience with central Europeans is that many look leptosomic in their youth while gaining in breadth with age. As Agrippa suggests, in this case it could also be a matter of class and attitude. This impression is perhaps also augmented by the "artistic" footage (they are not really standard group pics).
I would have guessed Poland (and I just looked at the thread for the first time and I came up with my guess solely from looking at the pictures without seeing the posts).
"I gaze into the moon which makes my mind pure as crystal lakes, my eyes cold as the darkest winter nights, but yet there is a flame inside. It guides me into the dark shadows beyond this world, into the infinity of thoughts..."