Diligent hands will rule, but laziness ends in slave labor.

殷勤人的手必掌权；懒惰的人必服苦。

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They wanted new states to be free from slavery, so they would not have to compete with slave labor.

VOA: special.2009.04.30

Well Pete, you see, there was this free labor system and this slave labor system," blah-blah blah-blah.

皮特你知道,当时北方是自由劳动制,而南方是奴役劳动制",等等,等等

耶鲁公开课 - 美国内战与重建课程节选

Essentially, it means any society where slave labor where the definition of labor, where the definition of the relationship between ownership and labor is defined by slavery.

从本质上来说,它是个奴隶劳动的社会,在这个社会里劳动的内涵,以及劳动者与其劳动所有权之间的关系,都被定义为奴役

耶鲁公开课 - 美国内战与重建课程节选

"It wasn't slave labor because I knew what I was getting into, " he said.

CNN: Booming Brazil lures immigrant workers

Slave labor in Brazil is not to be confused with slave labor of old.

FORBES: Brazilian Home Builder Nailed For 'Slave' Labor

Illegal charcoal camps were found to sometimes result in slave labor and the destruction of rainforest on protected indigenous lands.

FORBES: Green Accounting: A Greener Bottom Line?