Contact
- Mailing Address
- Attn: Robert Siebenaler, Secretary-Treasurer 143 Maurl DriveMinnesota City, MN 55959
- Phone
- (507) 312-5006 Thomas Ruben, President Listed on the 2025 LM-3 report (opens in new tab)
Officers 8
-
Thomas Ruben
President
-
Robert K. Siebenaler
Secretary-Treasurer
-
Andrew J. Wolfe
Vice President
-
Matthew F. Stoneburg
Recording Secretary
-
Roberta Frisch
Trustee
-
Timothy L. Ingersoll
Trustee
-
Dustin Semling
Trustee
-
Andrea Jaskola
Conductor Sentinal
An executive officer can send the current list.
Federal Filing
- Members Reported
- 121
- Last Report
- 2025
- Form
- LM-3
- File Number
- 59311
Members as the union reported them on its 2025 LM-3 report. Counts may include retirees and associate members.
NLRB cases for International Association of Machinists (IAM) Elections and unfair labor practice charges across the whole union, on LaborLab Search
Sources 2
- OLMS LM-3 report, 2025 (file no. 059-311) (opens in new tab)
Checked Oct 12, 2026
- OLMS filings for file no. 059-311, labordata.bunkum.us (opens in new tab)
Checked Oct 12, 2026
Listings come from public filings with the U.S. Department of Labor and from the organizations' own websites, as of the dates under Sources. Details change, and we may have them wrong. Check with the organization before you rely on them. Use Suggest an Edit above to tell us what's out of date.