Antonito in Conejos County, Colorado — The American Mountains (Southwest)
La Sociedad
— Guardians of the Culture —
Photographed by Cosmos Mariner, July 12, 2025
1. La Sociedad Marker
Language carries the culture. Read in English, the meanings here may differ from those of the traditional Spanish language of this area. The language, reminiscent of sixteenth century Spain, is a cornerstone of the culture.
For half a century after the Mexican American War, Hispanos in Colorado, New Mexico, and Utah struggled to adapt to ways of U.S. society without losing their lands, language, and unique culture. Their customs were different from many U.S. citizens. Communities and life were based on extended family, making a living on communal lands, and spiritual beliefs deeply rooted in Catholicism. Many had lost Spanish or Mexican land grants to deceitful individuals or groups. The American lifestyle often required them to leave ancestral farmlands and families for work in sugar beet fields, mines, and other industries far from home.
La Sociedad Protección Mutua de Trabajadores Unidos (SPMDTU) was founded in Antonito in 1900 by Celedonio Mondragón. Through non-violent actions, the organization's membership sought to combat exploitation of Hispano workers.
The SPMDTU is the longest surviving Hispanic organization in the United States. Bound together by proud traditions, values, religion, and a shared language, members of La Sociedad continue to serve Hispanic communities and maintain the
this page online
[other image captions]
• SPMDTU which stands for — La Sociedad Protección Mutua de Trabajadores Unidos. In English: Society for the Mutual Protection of United Workers.
• Banners from Antonito Concilio № 1 and devisas (insignia or badge).
Erected by Colorado Scenic and Historic Byways Commission, Colorado Historical Society, Colorado Department of Transportation, and The Nature Conservancy.
Topics. This historical marker is listed in these topic lists: Civil Rights • Fraternal or Sororal Organizations • Hispanic Americans • Labor Unions. A significant historical year for this entry is 1900.
Location. 37° 4.268′ N, 106° 0.715′ W. Marker is in Antonito, Colorado, in Conejos County. It is on U.S. 285 just south of 1st Avenue, on the right when traveling south. Touch for map. Marker is in this post office area: Antonito CO 81120, United States of America. Touch for directions.
Regionally, this marker is in Colorado’s San Juan Mountains and in the San Luis Valley. It is also in the American Mountain West. Globally, it is in North America, the Rocky Mountains, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once New Spain and also the Republic of Texas.
Other nearby markers. At least 8 other markers are within walking distance of this marker: Welcome to El Valle de San Luis (here, next to this marker); Foundations of Faith (here, next to this marker); Railroad Boom Town (here, next to this marker); Welcome to Colorado / Antonito Country (within shouting distance of this marker); The Cumbres & Toltec (within
2. Marker detail: Concilio Superior, the original SPMDTU Concilio building
It remains a beacon of solidarity for La Sociedad members from Colorado, New Mexico, and Utah. The SPMDTU Concilio building is a keystone of the organization. Constructed in 1925, it still stands on the west side of Antonito's Main Street (US Highway 285).
Related markers. Click here for a list of markers that are related to this marker. S.P.M.D.T.U. — Sociedad Protección Mutua de Trabajadores Unidos
Also see . . . Sociedad Protección Mutua de Trabajadores Unidos (History Colorado).
Excerpt: The Sociedad Protección Mutua de Trabajadores Unidos was founded in Antonito, Colorado on November 26, 1900 in the house of Celedonio Mondragón.(Submitted on August 29, 2025, by Cosmos Mariner of Cape Canaveral, Florida.)
Mondragón had been born and raised in the San Luis Valley before moving to Santa Fe to pursue jewelry as a career. While in Santa Fe, he was a member of an Hispano mutual aid society called La Orden de Caballeros de Protección Mutua por la Ley y Orden (The Order of the Knights of Mutual Protection by Law and Order). He returned to the Valley in the late 1890s, when he moved to Antonito and became a postmaster at nearby Cernicero, now Lobatos.
Antonitois in the center of Conejos County, the borders of which exactly match the original Sangre de Cristo Land Grant. During the late 1800s and early 1900s, the land grant was being bought up by United States and British investors. To help combat this, Mondragón organized with other Hispano men in the area to found a new mutual aid society that could provide financial and legal support. The group was financed by member dues and required its all-male membership to be lawful and upstanding citizens in order to maintain its brand of passive, collective resistance known as mutualismo or mutualism.painting courtesy Daniel Salazar3. Marker detail: Celedonio MondragónCeledonio Mondragón, along with a core group of men from Antonito, founded La Sociedad Protección Mutua de Trabajadores Unidos in 1900. Greatly honored by La Sociedad’s membership, Señor Mondragón’s statue stands prominently by the SPMDTU building in Antonito.
The SPMDTU quickly spread from Antonito and developed councils in towns and cities across the San Luis Valley. By 1903 the group had established its Concilio Superior (“high council”) in Antonito, which governed its affiliate councils. To form a local council, a community had to have ten willing members, petition the Concilio Superior and send member dues to the main office in Antonito.
Courtesy Antonio Esquibel
4. Marker detail: Segment of the Himno Oficial in Spanish and English
5. Marker detail: SPMDTU Concilio map
In the mid-1900s, sixty-five local SPMDTU concilios (councils) existed in Colorado, New Mexico, and Utah. This map shows the location of those in the San Luis Valley. Seven concilios survive into the present.
Photographed by Cosmos Mariner, July 12, 2025
6. La Sociedad Marker
Welcome “Caminante” — to Los Caminos Antiguos Scenic & Historic Byway and The Sangre de Cristo National Heritage Area
Looking south. This marker is the rightmost of two interpretive panels on the north side of the Los Caminos Antiguos Scenic & Historic Byway kiosk in Antonito. US Highway 285 is on the left.
Looking south. This marker is the rightmost of two interpretive panels on the north side of the Los Caminos Antiguos Scenic & Historic Byway kiosk in Antonito. US Highway 285 is on the left.
Photographed by Cosmos Mariner, July 13, 2025
7. SPMDTU Concilio Superior, 603 Main Street, Antonito, Colorado
The Don Celedonio Mondragón statue is on the left.
Credits. This page was last revised on March 1, 2026. It was originally submitted on August 28, 2025, by Cosmos Mariner of Cape Canaveral, Florida. This page has been viewed 105 times since then and 37 times this year. Photos: 1, 2, 3, 4, 5, 6, 7. submitted on August 29, 2025, by Cosmos Mariner of Cape Canaveral, Florida.
