Secret symbols including flags associated with far-right fascist movements and conspiracy theories have been spotted scattered throughout anti-vaccination protests in Canberra.
A record 20,00 people on Saturday marched through the nation's capital to Parliament House and among the crowd were World War Two-era Croatian flags, Australia's Red Ensign and upside down Australian flags.
The old Croatian flag is often associated with the the Ustaše - an ultra-fascist political movement between 1929 and 1945 whose members murdered hundreds of thousands of Jewish people and ethnic minorities.
The Ustaše were heavily influenced by Italian fascism and German Nazis and even built their own concentration camps to carry out their abhorrent crimes.
Various extremist groups now adopt the WWII-era flag to show their support for far-right causes.
The old Croatian flag - related to Nazi support - has been spotted throughout Canberra's anti-vaccination mandate protests among other conspiracy-related flags
Protesters have used the Australian Red Ensign flag to demonstrated they are 'sovereign citizens' and do not abide by the Australian government's laws
The Red Ensign flag was also on display at the protest.
Australia's maritime flag is used by the nation's merchant ships but has recently been adopted by Australia's 'Sovereign Citizen' - or SovCit - movement.
The bizarre conspiracy movement rejects the enforcement of all laws and taxation, considering them to be illegitimate - even on dry land.
Instead, members believe only maritime laws apply to them.
Another secret symbol at the demonstration was the upside down Australian flag.
Among the crowd were men who appeared to be former Australian soldiers, tradies, truckers, motorcyclists, evangelical religious groups, a smattering of
