Google translation...
"After this attack, the flag in the building was lowered and burned, and a swastika was hung in its place. After that day, the building was used to meet the housing needs of SA forces. The seizure of all trade union buildings now meant the end of the unions and the socialist labor movement, in and around Siegen. Meanwhile,
Fritz Fries, one of the labor leaders, was secretly murdered in Nazi torture houses.
At the local parliamentary meeting held in the Municipality of Siegen on May 8
[1933], the seats of other representatives were empty, except for the Nazis.
The political organs and unions of the labor movement were thus destroyed around Siegen, Wittgenstein and Olpe."
https://yenihayat.de/2-mayis-1933-siegen-wittgenstein-ve-olpe-cevresinde-isci-hareketi-ve-sendikalarin-yok-edilisi-2/IF the Burkat family was related to the Fries family, could this be the reason why they had to flee from Germany?
On the other hand, what did Bertha's status of "non-refugee" mean?