Teachers, journalists, police and judges alike have been caught in a net authorit

[Anhminh1232002]

Hello everyone,
I'm reading an article at http://edition.cnn.com/2016/07/20/europe/turkey-failed-coup-attempt/index.html
Could you please tell me the subject and predicative of the sentence.

Teachers, journalists, police and judges alike have been caught in a net authorities are casting wider by the day, in what is increasingly looking like a witch-hunt to suppress dissent.

Thank you.

[Anglophile]

Let me make an attempt.
Teachers, journalists, police and judges alike: Subject
have been caught in a net: Predicate
(which) authorities: Subject
are casting wider by the day,: Predicate
in what : Suject
is increasingly looking like a witch-hunt to suppress dissent.: Predicate
_________________
Anglophile
I know only one thing - that is that I know nothing.