Z‑0 — Appendix Overview Section 1 — White Nationalist Masked March During the U.S. 250th Anniversary Case Study Code: Z‑1 Date: 04 JUL 2026 Classification: Open‑Source IO Analysis Z‑1.0 Overview This case study documents the appearance of a masked white nationalist group during the United States’ Semiquincentennial celebrations in Washington, D.C. The group invoked heritage‑based authority claims (“true American heritage”) while simultaneously concealing their identities thro