New research reveals how union influence significantly lessens unequal representation in U.S. Congress.

This study combines detailed survey data with administrative records to examine the relationship between labor unions and legislative responsiveness across income levels. By analyzing preferences of 223,0️⣟ thousand individuals matched to congressional votes, researchers find that higher union membership correlates with greater political equality — reducing bias towards affluent constituents by six to eight percentage points.

The findings suggest that organized labor plays a crucial role in mitigating partisan advantage for the wealthy. Legislators from high-union districts demonstrate equal responsiveness to voters across income brackets. This effect appears driven by campaign contributions and strategic representation rather than other factors like policy or institutional controls.

This work provides compelling evidence about unions' impact on democratic governance, offering insights into effective strategies for promoting political equality.