bad working conditions
Because they wanted to
May 11, 1894. George Pullman cut the wages of his workers of the Pullman Palace Car Company by 25%, so they walked of the job and went on strike.
Slaves
The trade union movement began in response to poor working conditions and exploitation of workers during the Industrial Revolution in the 18th and 19th centuries. Workers came together to form unions to collectively bargain for better wages, shorter working hours, and improved working conditions. These unions fought for workers' rights and created a platform for workers to have a collective voice in their workplace.
1820s and 1830s in the western United States and northern Mexico
The more organized form of tap probably began in the 1830s.
Although there are general unions that will represent workers of any industry, the most logical route may be finding a union that represents your industry. I see you posted under the acting category, so you may want to start by looking into AFTRA. There are International Unions as well as local Unions, so you could also look into what unions are in your area and/or international unions listed by the AFL-CIO and Change To Win. Labor unions have organizers you can contact that (assuming they decide to try to organize your company's workforce) will begin an organizing campaign.
1930s
Labor Unions began because workers in the late 1800s received only 10 or so cents a day and they worked for long hours. Also, disasters such as fires happened in sewing shops, and all the doors would be locked. Workers decided to go on strike and request higher wages and better working conditions.
The Pullman Strike began in May 1894 when workers at the Pullman Company in Chicago went on strike to protest wage cuts and high rents in company-owned housing. The American Railway Union, led by Eugene V. Debs, supported the strike by refusing to handle trains that carried Pullman cars, which disrupted rail traffic nationwide. The federal government intervened, dispatching troops to break the strike, leading to violent clashes and several deaths. The strike effectively ended in July 1894 after the intervention, with the union's defeat marking a significant setback for labor movements at the time.
They needed workers for their plantations.
The first "labor unions" were Guild organizations and were very narrow in scope and dealt with only one type of craft activity. The first American labor unions dated from before 1800. The first was founded in 1794 in Philadelphia, by a group of shoemakers and called the Federal Society of Journeymen Cordwainers (shoemakers). In 1866 William Sylvis organized the National Labor Union and worked to organize workers in many different states and of different occupations. In 1869, a group of tailors, led by Uriah P. Stephens, formed the Noble and Holy Order of the Knights of Labor. In 1866, a union was organized that was composed of several associations of skilled workers. This union came to be called the American Federation of Labor, and held many successful strikes under the leadership of Samuel Gompers.