Here is Clive Hamilton in 2007 (emphasis added):
This is because the implications of 3C, let alone 4C or 5C, are so horrible that we look to any possible scenario to head it off, including the canvassing of “emergency” responses such as the suspension of democratic processes.
In addition to the ham-fisted private spying on Boggabri and Maules Creek activists, undercover operations and intelligence monitoring is almost certainly being undertaken by Australia’s official intelligence services, although it ought to be more difficult for the protesters to expose spies sent by ASIO or the federal police.
Savvy campaigners now assume that their communications are being routinely monitored. Greenpeace activists, for example, are in the habit of turning off their mobile phones when discussing campaigns. They leave them in another room under a pile of magazines, aware that they can be turned on remotely and used as listening devices. The video and audio facilities of their computers can also be used for snooping by outside forces. Putting masking tape over webcams is now a standard precaution.
On the one hand he is probably being melodramatic and paranoid; yet having suggested that he and/or his associates were canvassing the suspension of democratic processes it is hardly surprising that those organs of the state that are specifically designed to monitor that sort of thing might be keeping an eye on them.
Update: Have to enjoy the irony. This is the same man who said:
If Australia’s security services are not closely monitoring the activities of denialist activists then they are failing in their responsibilities.