Final answer:
Jonathan Walker assisted escaped slaves, becoming part of the Underground Railroad network, and was branded with "SS" for "slave stealer". His efforts were in line with the broader abolition movement advocating for immediate emancipation and equality.
Step-by-step explanation:
Jonathan Walker (1798-1878) contributed to the antislavery efforts by assisting escaped slaves in their journey to freedom. Walker is most notably recognized for the severe punishment he received as a result of these activities, where his hand was branded with "SS" for "slave stealer". By helping escaped slaves, Walker directly supported the Underground Railroad, a network of secret routes and safe houses established in the United States during the early to mid-19th century. Walker's personal sacrifices and advocacy for the abolition of slavery placed him among the ranks of prominent abolitionists who took tangible action to challenge the institution of slavery.
Not only did his actions assist those seeking freedom, but they also embodied the spirit of the broader abolition movement that sought the immediate end of slavery and worked towards equality for Black people in the United States. By braving the risks associated with aiding runaway slaves, Jonathan Walker's role in the antislavery movement represented a direct confrontation of the pervasive pro-slavery laws and attitudes of his time.