Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
The Peace Preservation Law criminalised organisations and advocacy aimed at altering the kokutai or abolishing private property, giving the state a powerful legal basis to repress socialist, communist, and anti-imperial activism. Later amendments sharpened penalties and expanded the coercive reach of the special higher police. The law is a central institutional anchor of late Taisho and early Showa Japan because it paired limited mass-politics incorporation with explicit ideological containment.
Per invariant 3, reforms are scored by what they did on each channel-separated axis, not by the party that enacted them. This fingerprint is how the policy-match engine finds historical analogues.
Explicit links are curated by the author. Inferred links are hypotheses in the library that test the same axes this policy moved — the framework's answer to "what does the data say about a policy like this?".
Ranked by axis-fingerprint overlap with this policy. Direction match bolded — those are the closest historical analogues. Shape of the match is what drives policy-outcome comparison, not the country or party label.