US · ongoing · ~7 min read
U.S. v. Sioux Erosion Control — Oklahoma infrastructure cartel
2017–2026 · erosion control, highway construction supplies, government contracting, small business cartels
An Oklahoma erosion-control company—not a Fortune 100 giant—was convicted of fixing prices on highway-related work worth over $100 million. Public projects paid more for sod and runoff control because rivals stopped competing.
The story
Highway jobs need erosion control: sod, mats, and related services that keep soil on site. In Oklahoma, a cluster of suppliers allegedly decided that competition was optional.
According to trial evidence, Sioux and others raised prices, divided the state, and either bid high on purpose or stayed out so a chosen firm could win. Taxpayers funding transportation projects absorbed the premium.
Four people pleaded guilty. Sioux and two individuals went to trial and lost in August 2026. Corporate fines could be enormous relative to a mid-size contractor’s size.
The case is a modern Procurement Collusion Strike Force showcase: regional SMEs on public infrastructure remain a core criminal antitrust target.
Why it matters
Infrastructure cartels hit public budgets directly.
Jury convictions show DOJ will try cases, not only take pleas.
Territory allocation is as illegal as naked price-fixing.
What was claimed
Price-fixing on erosion-control products and services.
Geographic allocation of contracts across Oklahoma.
Bid-rigging via high or non-bids.
The other side
Defendants contested the case at trial and were convicted.
Sentencing arguments and any appeals may follow.
What it means for you
Public-bid compliance programmes matter even for 20-person firms.
Do not ‘stay out of’ a region because a rival asked you to.
Preserve bid files; cover-bid patterns leave a paper trail.
Bottom line
Sioux Erosion Control’s conviction is a 2026 reminder that regional contractors face prison and corporate felony exposure for local cartels.
Timeline
2017–2023
Price, territory, and bid coordination
Prosecutors said conspirators fixed sod and erosion-control prices, carved up Oklahoma regions, and used cover bids or refusals to bid.
2024–2025
Charges and guilty pleas
Six individuals and one company were charged; four individuals pleaded guilty before trial.
Aug 2026
Trial conviction
Jury convicted Sioux, VP BG Dale Biscoe, and employee Randall David Shelton; sentencing to follow.
Key dates
- Conspiracy period
- 2017–2023
- Indictment unsealed
- 2024
- Jury conviction
- August 20, 2026
Formal snapshot
Summary: A federal jury convicted Oklahoma erosion-control firm Sioux Erosion Control Inc., a vice president, and an employee for a five-year conspiracy to fix prices, allocate territories, and rig bids on over $100 million in publicly funded highway-related contracts. Sentencing remained pending after the August 2026 verdict.
Regulator / plaintiff argument: Local erosion-control suppliers—including sod providers—raised and maintained prices, divided Oklahoma geographies, and submitted losing or no-bids so designated winners could overcharge public projects.
Outcome: August 20, 2026 jury convictions of the company and two individuals; four other individuals previously pleaded guilty; sentencing and final corporate fine TBD (statutory max up to $100 million for the corporation).
Conduct tags
Laws referenced
- Sherman Act §1 — 15 U.S.C. §1
Companies
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