...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」
...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」
... 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」
...Of course, this isconditional upon the maintenance and enforcement of the presentlaws...
William T. Hornaday 「Our Vanishing Wild Life」
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