Can authorities simply shut down platforms without a legal process?

Amid the recent riots caused in part by the lies being actively shared on the internet, arrests have been made and some have been sent to jail in the UK.  Not yet in Ireland though. But what about the internet platforms who were slow or even declined to remove what it knew to be racists and inflammatory rhetoric and accusations?  Simon Harris says that directors should be held personally liable. But can they and can authorities simply shut down platforms without a legal process?  We discuss with Michele Neylon the Chief Executive of Blacknight which is a domain registrar and hosting company.