Workers toiled under horrible conditions in —cramped workshops that were set up in shabby tenement buildings.

Workers toiled under horrible conditions in sweatshops —cramped workshops that were set up in shabby tenement buildings.

Explanation:

Sweatshops are workplaces that have poor conditions, crowded as well as unsanitary. These workspaces were prominent, especially during the Industrial Revolution.

Factory owners would employ workers with less pay, sometimes taking immigrants and children as workers. Though the production remains the same, some factories would try to pay less, leading them to employ 'illegal' workers. And at times, such workers were made to work in small, cramped spaces and unsanitary.  

sweatshops

Explanation:

Workers toiled under horrible conditions in sweatshops —cramped workshops that were set up in shabby tenement buildings.

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