Final answer:
Toussaint L'Ouverture was the more active participant in abolishing the slave trade, directly challenging the institution through his leadership in the fight against colonial powers to establish a free Haiti.
Step-by-step explanation:
The individual who was actively involved with the society for effecting the abolition of the slave trade between Thomas Jefferson and Toussaint L'Ouverture was Toussaint L'Ouverture. Although Thomas Jefferson held personal reservations about the institution of slavery, his actions to abolish it weren't as prominent or direct. Toussaint L'Ouverture, a former slave, emerged as a leader in the fight against Spain and England to establish a Haiti free of slavery and European colonialism. His actions directly challenged and resisted the institution of slavery.
Learn more about Abolition of the Slave Trade