An event that symbolizes the beginning of the modern labor union movement in the United States is the Paternal Order of the Sons of Rest strike of 1825, although more prominently marked by the Great Railroad Strike of 1877. These events mobilized workers against poor labor conditions and sparked awareness about labor rights. Labor unions began to form in response, advocating for better wages, hours, and working conditions. This movement laid the groundwork for future labor reforms and the establishment of organized labor as a crucial component of American society.