Fifteen years later , after her husband had been murdered in the Oranienburg concentration camp near Berlin , she made her way to Moscow , hoping to arrange for the publication of her husband 's political writings . Eight months after her arrival , identified as a " Trotskyist spy " she was caught up in the political purges of the late 1930s and first arrested in April 1936 . She was unable to leave the Soviet Union for another eighteen years , spending much ( though not all ) of that time in prisons or labour camps . She survived
the political purges
Great Purge
Zenzl Mühsam