Henry R Stiles in his 1867 history of Brooklyn references a 1755 census of slaves in Brooklyn:

“from which we learn that there were then in Brooklyn 133 slaves (53 of whom were females), owned by sixty-two persons, among whom John Bargay and Jacob Bruington were the largest holders, the former having seven and the latter five slave servants.”

Stiles further notes that:

“The last public sale of human beings in the town of Brooklyn, is believed to have been that of four slaves belonging to the widow Heltje Rappelje, of the Wallabout, in the year 1773. It occurred at the division of her estate, and was even at that time considered an odious departure from the time-honored and more humane practice, which then prevailed, of permitting slaves who wished to be sold, or who were offered for sale, to select their own masters.”

It took over 50 years for slavery to be officially abolished by law in New York State.  The New York 1799 Act for the Gradual Abolition of Slavery freed slaves born after that date on July 4, 1827.   This was followed many years later by an 1817 NY law that also freed slaves born before 1799 in 1827.

While he does say if this specifically happened in Red Hook, Brooklyn,  Stiles  writes that crops, generally associated with the South were grown here, namely tobacco and cotton. Both labor intensive plants to grow and harvest.