Skip to Content
Streetsblog California home
Streetsblog California home
Log In
Streetsblog USA

Koch Brothers-Backed Group Is Behind Assault on Phoenix Light Rail

Federal funding for projects like the South Central Light Rail in Phoenix, shown here in mural form, is much more uncertain under the Trump administration. Photo: Valley Metro

Dark-money out-of-state oil interests are bankrolling a ballot referendum that would quash Phoenix's popularly supported plans to build a light rail network, new documents help confirm.

This month, Phoenix voters will be asked to overturn Prop 104, which was approved overwhelmingly by Phoenix voters in 2015 to generate billions toward a regional system of light rail. Prop 105, up for vote Aug. 27, would instead divert the money to road projects.

But, according to records uncovered by the local alternative weekly newspaper, the Phoenix New Times, the group behind the new ballot measure is no a rag-tag team of south side business owners — as they have portrayed themselves. They are receiving funding and instruction from groups with ties to the billionaire oil industrialist Koch Brothers.

Many observers — including Streetsblog — have suspected the attack on transit, like similar efforts in Nashville and other cities, was tied to the Koch Brothers massive political network.

New emails obtained by reporter Steven Hsieh show that Prop 105 was coordinated behind the scenes by Scot Mussi, president of the Arizona Free Enterprise Club, a dark money group.

That "club" is a 501(c)4 nonprofit, meaning it doesn't have to disclose its donors. But in 2017, the group received $110,000 in funding from a political arm of Charles and David Koch, according to opensecrets.org, a political transparency nonprofit. That was about a fifth of the organization's total annual budget. The watchdog group Energy and Policy Institute, calls the Arizona Free Enterprise Club a "front group" that works to undermine political support clean energy in the state.

An email exchange between Mussi and the face of the opposition — a local small business owner named Celia Contreras — shows Mussi was revising and editing the language for Prop 105. Emails also shows Mussi was directing the signature-gathering effort. The organization used paid signature gatherers to collect the needed 20,000 signatures to introduce the ballot measure, offering $5.68 per signature, Hsieh reports.

A map of the planned light rail Phoenix voters approved overwhelmingly in 2015. Map: MovePHX
A map of the planned light rail Phoenix voters approved overwhelmingly in 2015. Map: MovePHX
false

Contreras, who owns a modest auto repair shop on South Central Avenue, and other businesses local business owners began their campaign last year after learning plans for South Central Light Rail would reduce the street with from four lanes to two. She believes the change would jeopardize her small business.

But Contreras told the New Times that when dark money outfits got involved and turned their concern into a larger assault on light rail citywide, their effort was tainted.

"They just used the businesses," Contreras told the New Times. "They don’t care about us."

She said she has not been involved with the group — which calls itself "Building a Better Phoenix" — since October.

Prop 104, the original pro-transit measure, passed in 2015 by an overwhelming 10-point margin. It raised the sales tax by 0.3 percent to build $31 billion in light rail lines and expand bus service, both to the south and west.

Only one, 28-mile light rail line has yet been constructed, and it has been the focus of the region's smart growth efforts. Five additional expansions would be halted if voters vote "yes" on 105 and the hot, fast-growing region would be left with almost no alternative to driving for decades to come.

Stay in touch

Sign up for our free newsletter

More from Streetsblog California

Monday’s Headlines

Another entry in the "how far will LA go to NOT make streets safer" files.

December 8, 2025

CAHSRA Releases Environmental Documents for LA to Anaheim

The 30-mile project section runs from LAUS to ARTIC and would follow an existing passenger and freight rail corridor, passing through parts of Los Angeles County and several Orange and Los Angeles County cities including Vernon, Commerce, Pico Rivera, Norwalk, Buena Park, Fullerton, and Anaheim.

December 5, 2025

Friday’s Headlines

LA is flunking Vision Zero, but what's happening at other parts of the state?

December 5, 2025

Friday Video: Exactly Why the Cybertruck Sucks

Unwind and let yourself hate on Elon Musk a little.

December 4, 2025

California Awards More Than $140 Million of Federal Funds for Local Road-Safety Programs

The projects are aimed at supporting the governor's modest goal of reducing traffic deaths by 30% in a decade.

December 4, 2025
See all posts