The Hardin County onion pickers strike was a strike by agricultural workers in Hardin County, Ohio, in 1934. Led by the Agricultural Workers Union, Local 19724, the strike began on June 20, two days after the trade union formed. After the kidnapping and beating of the union's leader and the intervention of the Ohio National Guard on behalf of the growers, the strike ended in October with a partial victory for the union. Some growers met the union's demand for a 35-cents-an-hour minimum wage, but the majority did not.
Hardin County, Ohio, contained a large onion-growing region about 12 miles (19 km) east of the town of Lima. Two main growing areas existed. Scioto Marsh consisted of about 17,000 acres (69 km²) of farmland. The top three growers controlled about 30 percent of Scioto Marsh land under cultivation. Hog Creek Marsh was a smaller growing area which consisted of about 4,000 acres (16 km²). The largest owner of Hog Creek marshland controlled about a third of that area's total land under cultivation. Roughly 25 smaller growers cultivated the rest of the farmland.
Wages and working conditions for agricultural workers in Hardin County were poor even before the onset of the Great Depression. A plentiful supply of Caucasian migrant farm workers kept wages far below those of other counties and states. Working conditions were harsh. Laborers worked on their hands and knees weeding and picking onions. The work day was 10 hours long, with a 15-minute break for lunch and no overtime. There were no toilet facilities or restroom breaks, and water and first aid for injuries or heat exhaustion were not provided. The black earth absorbed heat, and temperatures near the ground could reach 120 degrees Fahrenheit (49 °C). Many workers lived in employer-provided housing, and were given an employer-owned milk cow (on loan) to prevent starvation.
Crop yields from the Hardin County onion fields were declining significantly by 1930 due to soil exhaustion as crop rotation was not practiced. As the Great Depression worsened, growers reduced the amount of land under cultivation even further to only 3,500 acres (14 km²). Growers also cut wages and required laborers to work longer hours.