...Moreover, by the facility with which slavers coulddisguise their identity, it was possible for them to escape evena vigorous enforcement of our laws... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
... It is true that we do not often hear of the enforcement of the law, punishing as a crime the teaching of slaves to read, but this is not because of a want of disposition to enforce it...
Frederick Douglass 「My Bondage and My Freedom」
...If any president refuse to lend the executivearm of the government to the enforcement of the law, it can impeach thepresident...
Booker T. Washington, et al. 「The Negro Problem」
...The enforcement ofthe slave trade laws became notoriously lax and there was a tendencyto make slave codes harsher...
W.E.B. Du Bois 「The Negro」
...Beaver andotter were almost extinct some few years ago, but are now on theincrease, owing to a strict enforcement of the "GameAct...
William T. Hornaday 「Our Vanishing Wild Life」
...Other sections provide for the full enforcement of this law...
William T. Hornaday 「Our Vanishing Wild Life」
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