Who was the leader against the formation of political parties?

The leader against the formation of political parties in the early United States was George Washington. In his Farewell Address in 1796, he warned that political factions could lead to the erosion of national unity and the rise of divisiveness. Washington believed that political parties could create conflicts that would undermine the principles of democracy and the common good. His cautionary stance served as a significant warning about the potential dangers of partisanship.