Health chiefs spent thousands of pounds spying on Scottish Labour leader Anas Sarwar after he raised concerns about a scandal-hit hospital.
NHS Greater Glasgow and Clyde (NHSGGC) paid £15,000 a year to a company with links to Cambridge Analytica to monitor three opposition MSPs.
The Sunday Mail last month revealed how the health board had spied on widow Louise Slorance and posts about her late husband after she criticised NHSGGC over his care.
