Zuckergußgebäck said:I´d put him as a Man of the People Minister of Security.
I was quite amazed of how little there is on him on the net (indeed, all I found that was referring to him were some old supreme court records. I can only direct you to "Stalin. The Court of the Red Tsar" for some scattered information, such as 'Ulrich handled the court proceedings where [...] was tried'.
Yes, although my ideological aversion to popular historians like Simon Sebag Montefiore would probably kick in if I went anywhere near the book!
It sometimes helps with the Russian people if you do the search with the original cyrillic version of the name - but I'm not sure how 'Ulrich' would transliterate.... (Улрих...?)