If you don't know why he was arrested I suggest to check first before posting.
"In a statement, authorities said two British citizens and two Romanians were accused of forming a gang that recruited victims by “misrepresenting their intention to enter into a marriage/cohabitation relationship and the existence of genuine feelings of love”. Later, the victims were forced to perform pornography “through physical violence and mental coercion"."
From the guardian, link provided earlier in the thread.