What Is the Biggest Underground Fight Club in the World?
The answer depends on how you define "biggest." By YouTube subscribers, Streetbeefs leads. By total participants, Strelka dwarfs the competition. By revenue and mainstream recognition, BKFC is in a class of its own. And by pure underground notoriety, KOTS holds a claim that no other organization can match.
This FAQ breaks down the biggest underground fight clubs across every meaningful metric.
What is the biggest underground fight club by YouTube subscribers?
Streetbeefs -- 4.2 million subscribers
Streetbeefs is the most-subscribed underground fighting channel on YouTube. Founded in 2008 by Chris "Scarface" Wilmore in Harrisonburg, Virginia, the channel has accumulated over 1.3 billion total views across thousands of uploaded fight videos.
The top underground and bare knuckle fighting channels by subscribers:
- Streetbeefs: 4.2 million
- Strelka: 2.5 million
- Top Dog FC: 1.5 million
- KOTS: 1 million+
- Mahatch FC: 226,000
- KOTR: 100,000
These numbers reflect the massive audience for underground fighting content on YouTube, with the top four organizations alone accounting for over 9 million subscribers.
What is the biggest underground fight club by number of participants?
Strelka -- 10,000+ participants
Strelka is the world's largest amateur street fight championship by participant count. Founded in 2011 in St. Petersburg, Russia, the organization has staged events across Russia and CIS countries involving over 10,000 individual fighters. No other organization comes close to this number.
Strelka's massive participation is driven by:
- Open registration -- anyone can sign up through the website
- Amateur focus -- no professional experience required
- Geographic reach -- events across Russia, CIS countries, and expanding into Europe (including Rome, Italy)
- Cultural resonance -- street fighting culture is deeply embedded in Russian and CIS societies
What is the biggest underground fight club by revenue?
BKFC -- estimated tens of millions annually
If you include BKFC in the "underground" category -- which is debatable, since it is a fully sanctioned, regulated professional promotion -- it is by far the largest by revenue. BKFC generates income through:
- DAZN streaming deal
- PPV events
- Sponsorships
- International expansion
- Merchandise
BKFC's 2024 ownership restructuring -- with Conor McGregor joining as co-owner alongside Triller -- positions the promotion as a multi-million-dollar enterprise that dwarfs every grassroots underground organization financially.
Among purely underground (unsanctioned) organizations, revenue is harder to measure. Streetbeefs likely generates the most through YouTube ad revenue, given its 4.2 million subscribers and 1.3 billion views.
What is the biggest underground fight club by cultural impact?
This is the most subjective metric, but several organizations have outsized cultural footprints:
KOTS -- KOTS has defined the modern image of the underground fight club. When people picture an illegal fight club -- concrete floors, abandoned warehouses, no rules, anonymous organizers -- they are usually picturing KOTS. Its influence on the European hooligan fighting scene and its role in popularizing the warehouse fight format give it a cultural impact that exceeds its subscriber count.
Streetbeefs -- The "Guns Down, Gloves Up" philosophy has influenced dozens of imitators and has been covered by The New York Times, ESPN, and The Washington Post. Streetbeefs mainstreamed the concept of organized backyard fighting as dispute resolution.
Kimbo Slice's backyard fights -- While not an organization, Kimbo Slice's viral backyard fights in the mid-2000s launched the entire modern underground fighting movement. Every organization that followed owes something to Kimbo's proof of concept.
Calcio Storico -- As a 500-year-old tradition in Florence, Italy, Calcio Storico's cultural significance is unique. It is not the biggest by any commercial metric, but it is the oldest organized fighting event in continuous operation.
What is the biggest underground fight club in the United States?
Streetbeefs is the largest underground fighting organization in the United States by every meaningful metric -- YouTube subscribers (4.2 million), total views (1.3 billion+), longevity (since 2008), and cultural recognition.
Other notable US-based organizations include:
- Rough N Rowdy: The largest amateur boxing event series, backed by Barstool Sports
- Backyard Squabbles: Growing Los Angeles-based operation
- East Bay Rats: Legendary Oakland fight nights running since 1996
If you include sanctioned promotions, BKFC is the largest US-based fighting organization in the bare knuckle space.
What is the biggest underground fight club in Europe?
The answer depends on the country:
- Sweden/Pan-European: KOTS -- the most notorious underground fight club in Europe, drawing fighters from across the continent
- Russia: Strelka (by participants) and Top Dog FC (by production scale)
- United Kingdom: KOTR in Manchester is the most prominent, with Spartan BK and UBKB in the bare knuckle space
- Ukraine: Mahatch FC in Kyiv
- France: FPVS on the French Riviera
- Denmark: UUF (Ultimate Underground Fights)
Europe has a more fragmented underground fighting scene than the United States, with organizations scattered across countries and operating in different legal frameworks.
Is there one single "biggest" underground fight club?
No single organization dominates across all metrics. The underground fighting world is fragmented by geography, language, format, and legal status. The answer to "what is the biggest" depends on what matters to you:
- Audience reach: Streetbeefs
- Participation scale: Strelka
- Commercial size: BKFC (if included)
- Underground credibility: KOTS
- Historical significance: Calcio Storico or East Bay Rats
The diversity of the scene is part of what makes underground fighting a global phenomenon rather than a single, unified sport.
For a count of all known organizations, see our underground fighting organizations FAQ. For a complete overview of the scene, see our underground fighting FAQ.