The Commonwealth Security Service (CSS) was an arm of the earlier forms of the
Commonwealth Police of
Australia.
It operated in the 1930s and 1940s, and was amalgamated with the Commonwealth Investigation Branch, to form the Commonwealth Investigation Service (CIS) in 1946.
It was involved in monitoring events and organisations considered problematic by the government of the time, including strikes
1948 Queensland railway strike
References
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See also
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Commonwealth Police
Defunct law enforcement agencies of Australia
Defunct Commonwealth Government agencies of Australia