British intelligence, the right wing, or international conspiracies. (Content varies quite a bit from issue to issue, so it’s not easy to characterize.)
Big SISter is a little newsletter published by OASIS (Organization to Abolish the Security Intelligence Service), which reports on domestic spying and foreign involvements of New Zealand’s SIS.
The British newsletter Counterpoint and the U.S.-based Nightwatch are likewise specific in their focus: Soviet propaganda and disinformation. But where Counterpoint is analytical, trying
to deduce the goals of specific propaganda projects by close study
of the products (or suspected products), Nightwatch indulges in a lot more free-floating paranoia and Cold War speculation.
