# Different but Synergistic Effects of Union and Manager Leadership on Member Job Satisfaction

## TL;DR

This study explores how union and manager leadership together affect workers' job satisfaction, finding that union support and ethical management play connected roles.

## Contribution

The study introduces union instrumentality as a mediator and shows how managerial ethical leadership conditions the impact of union leadership on job satisfaction.

## Key findings

- Union instrumentality mediates the relationship between service-oriented union leadership and job satisfaction.
- Managerial ethical leadership moderates the mediated relationship through union instrumentality.
- The combined effects of union and managerial leadership influence member job satisfaction.

## Abstract

Existing research has tended to overlook the diverse roles of union leadership in contributing to member attitudes. Drawing on the social information processing theory, this study examines how union leaders’ (shop stewards) service-oriented leadership relates to member job satisfaction. To clarify the mechanism underlying this relationship, this study focuses on union instrumentality as a mediator. The research also examines managers’ ethical leadership as a conditional factor in the relationship between union leaders’ service-oriented leadership and member job satisfaction through union instrumentality. To test our hypothesis, this study analyzed the results of a survey of 603 respondents from two branches of the Korean Metal Workers’ Union. The findings of this study indicate that union instrumentality is the link between service-oriented union leadership and member job satisfaction. Additionally, the strength of the mediated relationship between the aforementioned factors through union instrumentality is contingent on managerial ethical leadership. This study contributes to an integrated understanding of the way in which service-oriented union stewards and ethical managers influence member job satisfaction through their leadership.