| Cintas Corporation | Cintas | business services | labor relations violation | 2010 | $25,719 |
| CINTAS CORPORATION | Cintas | business services | labor relations violation | 2002 | $11,600 |
| Cintas Corp. | Cintas | business services | labor relations violation | 2008 | $29,596 |
| Cintas Corp. | Cintas | business services | labor relations violation | 2008 | $25,500 |
| CINTAS | Cintas | business services | labor relations violation | 2016 | $21,791 |
| Cingular Wireless | AT&T | telecommunications | labor relations violation | 2006 | $10,000 |
| Cingular Wireless | AT&T | telecommunications | labor relations violation | 2006 | $7,000 |
| Cingular Wireless | AT&T | telecommunications | labor relations violation | 2004 | $8,000 |
| Cinevue, Inc. d/b/a The Lusty Lady | | | labor relations violation | 2001 | $10,000 |
| Cinergy Corporation | Duke Energy | utilities and power generation | labor relations violation | 2000 | $50,000 |
| CINERGY CORP. | Duke Energy | utilities and power generation | labor relations violation | 2006 | $60,000 |
| CINERGY CORP. | Duke Energy | utilities and power generation | labor relations violation | 2000 | $50,000 |
| CineFocus Productions, LLC; HLK Visions, Inc. and Casting The Net, LLC | | | labor relations violation | 2020 | $61,159 |
| CINCINNATI BELL TELEPHONE A DIVISION OF BROADWING | Macquarie | financial services | labor relations violation | 2005 | $5,000 |
| CINCINNATI BELL | Macquarie | financial services | labor relations violation | 2004 | $39,200 |
| Cimato Brothers, Inc. | | | labor relations violation | 2003 | $10,000 |
| Cicogna Electric & Sign Company | | | labor relations violation | 2003 | $10,000 |
| Cibao Meat Products, Inc. | | | labor relations violation | 2008 | $62,782 |
| CIBA Specialty Chemicals, Inc. | BASF | chemicals | labor relations violation | 2005 | $10,000 |
| Ciampa Management Corp. | | | labor relations violation | 2016 | $29,962 |
| CI Wilson Academy | | | labor relations violation | 2003 | $32,000 |
| Church World Service | | | labor relations violation | 2019 | $19,000 |
| Church Homes Inc. | | | labor relations violation | 2010 | $2,550,000 |
| Church & Dwight | Church & Dwight | household and personal care products | labor relations violation | 2006 | $11,290 |
| CHS THERAPY SERVICES II, LLC | | | labor relations violation | 2022 | $15,545 |
| CHS THERAPY SERVICES II, LLC | | | labor relations violation | 2022 | $8,759 |
| CHS Inc. | CHS Inc. | agribusiness | labor relations violation | 2010 | $10,279 |
| CHS Community Health Systems, Inc. d/b/a Mimbres Memorial Hospital and Nursing Home | | | labor relations violation | 2019 | $9,625 |
| CHS Community Health Systems, Inc. d/b/a Mimbres Memorial Hospital and Nursing Home | | | labor relations violation | 2019 | $159,576 |
| Chrysler, LLC f/k/a DaimlerChrysler Corp. | Stellantis | motor vehicles | labor relations violation | 2009 | $100,000 |
| Chrysler Parts Distribution Center | Stellantis | motor vehicles | labor relations violation | 2008 | $100,000 |
| CHRISTUS Spohn Hospital Corpus Christi - Shoreline | CHRISTUS Health | healthcare services | labor relations violation | 2010 | $26,789 |
| Christos Cleaning Services, Inc. | | | labor relations violation | 2009 | $100,000 |
| Christian Labor Association | | | labor relations violation | 2000 | $7,295 |
| Christian Disposal, LLC | | | labor relations violation | 2008 | $13,450 |
| Christian Brothers Heating & Air Conditioning, Inc. | | | labor relations violation | 2004 | $23,123 |
| Christensen Arms | | | labor relations violation | 2022 | $16,010 |
| Christensen & Ehret, LLP | | | labor relations violation | 2017 | $9,884 |
| Chris Washburn's Boat Yard, Inc. | | | labor relations violation | 2017 | $6,708 |
| Chrill Care, Inc. | | | labor relations violation | 2003 | $22,117 |
| Choice Fabricators, Inc. | | | labor relations violation | 2000 | $5,500 |
| Choctaw Erectors, Inc. | | | labor relations violation | 2006 | $57,546 |
| CHM Contracting | | | labor relations violation | 2016 | $7,000 |
| Chipotle Services LLC d/b/a Chipotle Mexican Grill | Chipotle Mexican Grill | restaurants and foodservice | labor relations violation | 2018 | $10,451 |
| Chipotle Mexican Grill, Inc. | Chipotle Mexican Grill | restaurants and foodservice | labor relations violation | 2011 | $6,513 |
| Chipotle Mexican Grill, Inc. | Chipotle Mexican Grill | restaurants and foodservice | labor relations violation | 2020 | $54,136 |
| CHIPOTLE MEXICAN GRILL | Chipotle Mexican Grill | restaurants and foodservice | labor relations violation | 2023 | $240,000 |
| Chipotle Grill | Chipotle Mexican Grill | restaurants and foodservice | labor relations violation | 2020 | $5,737 |
| Chinese Community Concerns Corporation Chinatown Head Start | | | labor relations violation | 2014 | $35,003 |
| Chinchilla Theatrical Scenic | | | labor relations violation | 2021 | $5,639 |
| Chinatown Carting Corp. | | | labor relations violation | 2008 | $333,350 |
| ChimeOn, Inc. d/b/a GoodChime!, Vitalspring Technologies, Inc., Single Employer | | | labor relations violation | 2013 | $80,000 |
| Chimento Construction | | | labor relations violation | 2011 | $11,560 |
| Chillicothe Metal Company | | | labor relations violation | 2004 | $36,500 |
| Childrens' Hospital | | | labor relations violation | 2005 | $12,000 |
| Children's Hospital & Research Center at Oakland d/b/a Children's Hospital of Oakland | | | labor relations violation | 2017 | $37,735 |
| Children's Home of Detroit | | | labor relations violation | 2005 | $13,000 |
| Children's Garden Childcare and Pre-School Center | | | labor relations violation | 2018 | $5,890 |
| Children's Garden Childcare and Pre-School Center | | | labor relations violation | 2018 | $5,890 |
| Children's Center for Behavioral Development | | | labor relations violation | 2010 | $70,565 |
| Children Studio School | | | labor relations violation | 2005 | $34,370 |
| Child Devlopment Council of NE PA | | | labor relations violation | 2006 | $177,510 |
| Child Development Services of Ottawa County, Inc. | | | labor relations violation | 2010 | $5,560 |
| Child Care Resources, Inc. | | | labor relations violation | 2005 | $8,960 |
| Child Care Resources, Inc. | | | labor relations violation | 2005 | $8,000 |
| Chico's FAS, Inc. d/b/a Chico's | Chico's FAS | retailing | labor relations violation | 2007 | $17,000 |
| Chickasaw | | | labor relations violation | 2002 | $5,000 |
| Chicago Vendor Supply | | | labor relations violation | 2001 | $7,006 |
| Chicago Tube & Iron Company | Olympic Steel | metals | labor relations violation | 2002 | $10,000 |
| Chicago Teachers Union | | | labor relations violation | 2004 | $27,000 |
| Chicago Teachers Union | | | labor relations violation | 2001 | $108,612 |
| Chicago Symphony Orchestra Association | | | labor relations violation | 2019 | $108,331 |
| Chicago Rivet & Machine Co | | | labor relations violation | 2023 | $25,000 |
| Chicago Restaurant Partners, LLC | | | labor relations violation | 2009 | $7,000 |
| Chicago Restaurant Partners LLC | | | labor relations violation | 2008 | $7,000 |
| Chicago Packaging Company | | | labor relations violation | 2010 | $12,000 |
| Chicago International Trucks | | | labor relations violation | 2011 | $15,363 |
| Chicago Hilton and Towers | Park Hotels & Resorts | hotels | labor relations violation | 2007 | $31,087 |
| Chicago Flow Plumbing, LLC and Miho's Plumbing and Heating, Inc., Joint Employers | | | labor relations violation | 2021 | $19,783 |
| Chicago Expansion Bolt Company and/or Chicago Name Plate and/or Ameribest Fasteners, L.L.C. | | | labor relations violation | 2003 | $17,120 |
| Chicago Children's Advocacy Center | | | labor relations violation | 2016 | $7,450 |
| Chicago Casting Co., LLC | | | labor relations violation | 2006 | $12,000 |
| Chicago and Northeast Illinois District Council of Carpenters, Chicago and Northeast Illinois District Council of Carpenters, Local 1 and Local 1889 | | | labor relations violation | 2003 | $20,000 |
| Chiappetti Wholesale Meats and Chiappetti Meat Distribution Co., single employers and/or alter egos | | | labor relations violation | 2011 | $44,625 |
| Chevron Products Co. | Chevron | oil and gas | labor relations violation | 2000 | $67,000 |
| Chevron Mining, Inc. f/k/a The Pittsburg & Midway Coal Mining Company | Chevron | oil and gas | labor relations violation | 2012 | $1,316,790 |
| Chestnut Point Care Center | | | labor relations violation | 2009 | $100,000 |
| Chesterfield Awning Company, Inc. | | | labor relations violation | 2010 | $24,000 |
| Chesapeake Mechanical, Inc. | | | labor relations violation | 2010 | $9,000 |
| CHESAPEAKE ENERGY (FORMERLY COLUMBIA NATURAL RESOURCES) | Expand Energy Corporation | oil and gas | labor relations violation | 2007 | $30,000 |
| Cheryl D. Ackerman, MD. PC | | | labor relations violation | 2011 | $10,000 |
| Cherryland Electric Co-Op | | | labor relations violation | 2003 | $25,000 |
| Cherrydale Farms, LLC & Contemporary Personnel, a Joint Employer | | | labor relations violation | 2008 | $6,990 |
| Cherrydale Farms, LLC | | | labor relations violation | 2008 | $6,990 |
| Cherrydale Farms, LLC | | | labor relations violation | 2008 | $6,990 |
| Cherry Valley Concrete, Inc. | | | labor relations violation | 2004 | $17,607 |
| Cherry Tree Pharmacy, Inc. | | | labor relations violation | 2016 | $15,000 |
| CHERRY HILL HOTEL MANAGEMENT, LLC, d/b/a CROWNE PLAZA PHILADELPHIA/CHERRY HILL | | | labor relations violation | 2013 | $5,335 |
| Cherry Auto Parts, Inc. | | | labor relations violation | 2009 | $10,219 |
| Cherokee Medical Services, LLC/Teltara LLC | | | labor relations violation | 2009 | $17,000 |
| Cherokee Medical Services LLC/Teltara LLC | | | labor relations violation | 2009 | $21,000 |
