FIGHT CLUB
FINDER
The complete comparison terminal for underground combat. Filter all 22 fighting organizations by country, format, and status — then sort them head-to-head on reach, founding year, and legality. No hype, just the data.
Underground · Bare-Knuckle · Amateur · Traditional
Organizations
22
Countries
10
Active
19
Bare-Knuckle
9
Showing 22 / 22
| King of the Streets KOTS · Gothenburg | Sweden | UNDERGROUND | 2013 | 1M | Active |
|---|---|---|---|---|---|
| Streetbeefs Harrisonburg, Virginia | United States | AMATEUR | 2008 | 4.2M | Active |
| Strelka Street Fight Championship Strelka · St. Petersburg | Russia | AMATEUR | 2011 | 2.5M | Active |
| Top Dog Fighting Championship Top Dog FC · Moscow | Russia | BARE-KNUCKLE | 2019 | 1.5M | Active |
| King of the Ring KOTR · Manchester | United Kingdom | AMATEUR | 2021 | 100K | Active |
| Mahatch Fighting Championship Mahatch FC · Kyiv | Ukraine | BARE-KNUCKLE | 2020 | 226K | Active |
| Bare Knuckle Fighting Championship BKFC · Philadelphia | United States | BARE-KNUCKLE | 2018 | — | Active |
| BKB Bare Knuckle Boxing BKB · Miami | United States | BARE-KNUCKLE | 2015 | — | Active |
| Backyard Squabbles Los Angeles, California | United States | AMATEUR | 2020 | 20K | Active |
| Rough N' Rowdy RnR · Wheeling, West Virginia | United States | AMATEUR | 2014 | — | Active |
| Ultimate Underground Fights UUF · Location undisclosed | Denmark | UNDERGROUND | — | — | Active |
| East Bay Rats Fight Night Oakland, California | United States | UNDERGROUND | 1996 | — | Active |
| FPVS FPVS · French Riviera | France | UNDERGROUND | — | — | Active |
| Holmgang Fighting Holmgang · Location undisclosed | Germany | TRADITIONAL | — | — | Active |
| Calcio Storico Fiorentino Calcio Storico · Florence | Italy | TRADITIONAL | 1530 | — | Active |
| Spartan BK Fight Club Spartan BK · North England | United Kingdom | BARE-KNUCKLE | — | — | Active |
| Ultimate Bare Knuckle Boxing UBKB · Warrington | United Kingdom | BARE-KNUCKLE | — | — | Active |
| Bad to the Bone BTTB · Stoke-on-Trent | United Kingdom | BARE-KNUCKLE | 2018 | — | Active |
| Valor Bare Knuckle VBK · Cheyenne, Wyoming | United States | BARE-KNUCKLE | 2019 | — | Active |
| Underground Combat League UCL · New York City | United States | UNDERGROUND | 2003 | — | Defunct |
| Felony Fights Location undisclosed | United States | UNDERGROUND | 2005 | — | Defunct |
| BKFC Thailand / BKFC Asia BKFC Asia · Pattaya | Thailand | BARE-KNUCKLE | 2021 | — | Defunct |
HOW TO USE THIS TOOL
Start with the filter chips to narrow the field by type — raw underground no-rules clubs, amateur backyard promotions, professional bare-knuckle leagues, or traditional combat traditions — and by whether an organization is still active. Use the country dropdown to focus on a single region, or the search box to match a name, city, or tag.
Then sort the table by any column. Rank organizations by Reach (their largest YouTube or Instagram following) to see who dominates attention, by Founded to trace the scene from the 16th-century origins of Calcio Storico to today's viral clubs, or by Country to map the underground worldwide. Every organization name links to a full breakdown of its rules, how to watch, and how to join.
FREQUENTLY ASKED QUESTIONS
How many underground fighting organizations are there?
This tool tracks 22 organizations across 10 countries, spanning no-rules underground clubs, amateur backyard promotions, professional bare-knuckle leagues, and traditional combat traditions. 19 are currently active and 3 are defunct (the Underground Combat League, Felony Fights, and BKFC Asia).
Which underground fight clubs pay fighters?
The professional, sanctioned bare-knuckle promotions operate like real leagues with paid cards and streaming or pay-per-view revenue: Bare Knuckle Fighting Championship (streamed on DAZN), BKB Bare Knuckle Boxing, Ultimate Bare Knuckle Boxing, Valor Bare Knuckle, Mahatch FC, and Top Dog FC. Rough N' Rowdy runs as a Barstool Sports pay-per-view. By contrast, raw underground clubs like King of the Streets, FPVS, and Ultimate Underground Fights are invitation-only and built around participation and respect rather than prize money.
Which underground fighting organizations are legal?
Several are fully legal and regulated. Spartan BK is the UK's only licensed and legal bare-knuckle hay-bale club; BKFC is sanctioned by state athletic commissions; UBKB is sanctioned by the WSBKB; and Calcio Storico and Holmgang run as sanctioned traditional events. No-rules clubs such as King of the Streets, FPVS, and Felony Fights operate illegally or entirely outside regulation.
How do I join an underground fight club?
It depends on the organization. Streetbeefs, Rough N' Rowdy, and BKFC take applications through their websites; East Bay Rats lets anyone who shows up to Friday Fight Night volunteer to fight; and secretive clubs like King of the Streets, Ultimate Underground Fights, and FPVS are invitation-only, sharing locations through encrypted messages. Use the tool's How to Join details on each organization page before reaching out.
Which is the biggest underground fighting organization?
By social reach, Streetbeefs is the largest with 4.2 million YouTube subscribers and 1.3 billion views. Strelka is the largest by participation, with over 10,000 amateur fighters. Among professional promotions, BKFC is the biggest and most mainstream bare-knuckle organization in the world.
Where do underground fights take place?
Venues range from abandoned warehouses and concrete lots (King of the Streets, Ultimate Underground Fights, FPVS) to residential backyards (Streetbeefs, Backyard Squabbles), hay-bale pits and sand rings (Top Dog FC, Spartan BK, Strelka), and sanctioned arenas (BKFC, UBKB). Locations are often kept secret until fight night.
Methodology
Every figure in this comparator is drawn from our hand-maintained dataset of 22 underground fighting organizations. Social reach reflects the larger of each organization's YouTube subscriber count or Instagram following at the time of review; a dash (—) means the figure is not publicly known and has never been estimated. Founding years, locations, rules, and status are verified against each organization's own channels and reputable coverage.
Last updated 2026-07 · 19 active · 3 defunct