CACrown ArchivesThe cinema collection
Menu
Research dossier · General Reference

Laborers' International Union of North America

American and Canadian labor union

Cross-disciplinary reference desk with index cards, atlas, dictionary and catalogue
General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionAug 18, 2026
Entity authorityQ6467331
Source-derived summary

The Laborers' International Union of North America (LIUNA, stylized as LiUNA!), often shortened to just the Laborers' Union, is an American and Canadian labor union formed in 1903. As of 2017, they had about 500,000 members, about 80,000 of whom are in Canada. The current general president is Brent Booker who was appointed in 2023. There are nine regions across North America; these regions are further divided into 500 local unions. LIUNA Local 183 of Toronto is the largest construction local union in North America, and is led by Joseph Mancinelli.

History

1900–1920

LIUNA's origins stretch back to the 19th century when local construction unions began popping up across the United States. Then, in March 1903, Samuel Gompers, the President of the American Federation of Labor (AFL), successfully persuaded various local construction unions from across the US to unite in order to consolidate power in their fight against unfair labor practices.

As a result, on April 13, 1903, the International Hod Carriers and Building Laborers' Union (IHC and BLC) was established at its founding convention in Washington, DC. At the convention there were 25 delegates from 23 unions in 17 different cities in attendance. During the course of the convention the delegates elected a General President, Herman Lilien, a General Secretary-Treasurer, Harold Stemburgh, and adopted a Declaration of Principles. Also, the delegates were able to produce the union's first charter, which claimed jurisdiction over:Wrecking of buildings, excavations of buildings, digging of trenches, piers and foundations, holes, digging, lagging, sheeting of said foundations, holes, and caisson work, concrete for buildings, whether foundations, floors or any other, whether done by hand or any other process, tending to masons, mixing and handling all materials used by masons (except stone setters), building of centers for fireproofing purposes, tending to carpenters, tending to and mixing of all materials for plastering, whether done by hand or any other process, clearing of debris from buildings, shoring, underpinning and raising of old buildings, drying of plastering, when done by salamander heat, handling of dimension stones.Nine years later, in 1912, the IHC and BLC experiences two name changes.

Editorial summary

This brief starts where responsible research should: with the source description of “Laborers' International Union of North America” as american and Canadian labor union. Everything that follows is an evidence route, not borrowed authority.

Editorial reviewA dependable orientation record for establishing vocabulary, names and a first evidence trail. The current lead gives the account dated anchors—1903, 2017, 2023, 1900—that can be checked directly. The linked authority record independently contributes the date 1903-04-13. The account is most persuasive where Laborers', International and Union can be independently traced.
Editorial analysis

Why this record matters

The subject matters to the general reference register because the source frames it as american and Canadian labor union. Its deeper value depends on whether names, dates, institutions and citations support that framing.

Evidence profile

Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Aug 18, 2026. The linked authority identifier is Q6467331. VIAF identifies the subject as 148470046. The Library of Congress control number is n80147001. 1 of 4 selected statements include explicit references; 1 carry qualifiers and 1 use preferred rank. The first chronological checks are 1903, 2017, 2023 and 1900.

Critical limits

Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

Best used for
  • Subject orientation
  • Search vocabulary
  • Locating named sources
Verify next

The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “Laborers' International Union of North America”, its source revision and the description used here.
  2. Expand the search: follow Laborers' International Union of North America primary sources, Laborers' International Union of North America archive and Laborers' research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “Laborers' International Union of North America”?
  2. Which institution is responsible for the underlying evidence?
  3. Which cited source is closest to the event, object or claim?
Subject index

Search terms from this dossier

Source & attribution

This entry incorporates text from Laborers' International Union of North America” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.