I am not here is an article for you so you can read up on it https://www.welt.de/politik/deutschland/article255845278/Wegen-Stuermung-von-Uni-Gebaeude-Erstmals-Exempel-statuiert-Berlin-plant-Ausweisung-auslaendischer-Israel-Hasser.html

While it is true that they are not convicted, all 4 of them are prime suspects in the destruction of university property and in threatening university staff with weapons, which is legally enough of a reason to throw even eu citizens out.