Anarchism

Ned Kelly was an Australian outlaw, known for his defiant stand against colonial authorities in the late 19th century, culminating in his capture and execution after leading a rebellion against the police.

The Jerilderie Letter doesn't explicitly mention anarchism, but its themes align pretty good with anarchist principles.

Ned Kelly criticizes the established authority, particularly the colonial legal system, and speaks out against police brutality and the exploitation of his family, which aligns with anarchist critiques of state power and hierarchical structures.

Hs rejection of authority and advocacy for justice and equality can be seen as a precursor to some of the anti-authoritarian ideas found in anarchist thought.