Alcatraz-Federal-Penitentiary #16258186
Description
Alcatraz Federal Penitentiary was a maximum-security prison located on Alcatraz Island off the coast of San Francisco from 1934 until it closed in 1963. Popularly known as “The Rock,” on average there were about 260 prisoners incarcerated on Alcatraz at any given time.
Written by the group; not a statement by this register.
Membership history
Growth
Growth history is still building. We hold one measurement for this entry. A trend needs at least two, taken days apart — so this will fill in on its own rather than being estimated. We do not publish numbers we have not measured.
| Measured (UTC) | Members | Change |
|---|---|---|
| 26 Oct 2026, 20:26 | 1 | first reading |
Ownership
Owned by Harvey (@CostanzeJValenti) as measured.
Groups seen changing owner — the largest ever handed over and the most recent — are on the ownership transfers board.
Members we’ve seen
Harvey (@CostanzeJValenti) — Holder (rank 255)
A sample — only members this register has independently measured, highest rank first. Not the full roster.
Rank structure
Roles and per-rank member counts as Roblox reports them (rank 0 = guest … 255 = owner).
Open data
Download this group’s measured record — free to reuse with attribution: membership history (CSV) · full record (JSON)
Each file carries its licence and retrieval time inside it, and is generated from the same measurements shown above.