BERLIN — Ikea has long been famous for its inexpensive, some-assembly-required furniture. On Friday the company admitted that political prisoners in the former East Germany provided some of the labor that helped it keep its prices so low.

A report by auditors at Ernst & Young concluded that Ikea, a Swedish company, knowingly benefited from forced labor in the former East Germany to manufacture some of its products in the 1980s. Ikea had commissioned the report in May as a result of accusations that both political and criminal prisoners were involved in making components of Ikea furniture and that some Ikea employees knew about it.

“Even though Ikea Group took steps to secure that prisoners were not used in production, it is now clear that these measures were not effective enough,” the company said in a statement on Friday.

The use of political prisoners as forced labor, even decades ago, is a publicity disaster for a company that with its familiar blue and yellow logo seems at times like a cultural ambassador for Sweden. Inexpensive Ikea furnishings have filled countless student apartments and the homes of millions of young families around the world.