Final answer:
Various political leaders have enacted social legislation to satisfy the demands of the Left and Labour Unions, including Truman's Fair Deal, Bismarck's social welfare policies, and Johnson's consumer protection and environmental laws.
Step-by-step explanation:
Throughout different periods in history, various political leaders passed social legislation to address the concerns of the Left and Labour Unions. For instance, during his presidency, Harry S. Truman pushed for a set of programs known as the Fair Deal, which included universal health insurance, increased federal aid to schools, expansion of Social Security, the creation of public housing programs, and an increase in the minimum wage. Despite conservative opposition, he successfully enacted legislation that created public housing and expanded Social Security to more workers.
Moreover, figures like Otto von Bismarck implemented social welfare policies, such as pensions for workers, as a strategic measure to counteract socialism's appeal. In the United States, Lyndon B. Johnson also played a significant role in social reform, creating laws to improve consumer protection, public transportation, environmental quality, and supporting arts and humanities.
Overall, these historical leaders used social legislation as a tool to address inequalities and improve working and living conditions, prevent social discontent, and sometimes to politically outmaneuver opposition or mitigate social unrest.