Human Rights campaign group Liberty has called on Parliament to act over allegations police 'tried to spy' on Cambridge University students.
It said 'proper judicial checks' on police surveillance were 'badly overdue'.
And it warned that if protest groups were now considered 'fair game' it undermined policing and democracy itself.
More top news
Weather: Heavy rain and strong winds in the north
His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."
The company’s recently appointed Chief Executive Dara Khosrowshahi said the breach was made by two individuals outside the company.