Media bias is well documented in the industrial relations domain. This paper extends this research by exploring whether union participation among former professional baseball players affects the likelihood of moving through two stages of the selection process for the Major League Baseball Hall of Fame (HOF), a selection process controlled by sports media. At the HOF ballot inclusion stage, union activism increased position players’ and pitchers’ likelihoods of inclusion, regardless of time period. Conversely, at the HOF voting stage, position players who were union representatives during labor-management conflict (i.e., strikes and lockouts) received significantly less votes than non-activists, while position players who were representatives during labor-management cooperation received significantly more votes. Union activism did not affect pitchers at this stage. We conclude that union activists can be subject to negative media bias during labor-management conflict that, in turn, negatively affects post-employment outcomes.