What sideline was Professor Georges Schteinberg infamously engaged in?

Question

Until July 2000, Professor Georges Schteinberg taught Social Science and Hebrew Language at Liessin College in Rio de Janeiro, Brazil. At least, that was his DAY job.

What did he do after hours?

(Hint: he got into trouble for doing it.)

Answer 1

He was in the child pornography/prostitution business.