...Not only did thegovernment thus negatively favor the slave-trade, but alsomany conscious, positive acts must be attributed to a spirithostile to the proper enforcement of the slave-trade laws... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...Memorial of the American Missionary Association,praying the rigorous enforcement of the laws forthe suppression of the African slave-trade, etc...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...His commands were strong, his enforcement weak...
Frederick Douglass 「My Bondage and My Freedom」
...This laxity in the enforcement of the laws in general, and especiallyof criminal laws, makes such outbreaks as those in North Carolina andSouth Carolina of easy occurrence...
Booker T. Washington 「The Future of the American Negro」
...That was an object-lesson which required no enforcement...
E. Walter Maunder 「The Astronomy of the Bible」
...Governor Phillip soon found with great regret, thoughdoubtless without much surprise, that in the community committedto his care the strict enforcement of the sanctions of law waspeculiarly necessary...
Arthur Phillip 「The Voyage Of Governor Phillip To Botany Bay」
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