This study explores basic course directors' (BCDs) perceptions of graduate teaching assistant (GTA) misbehaviors in introductory communication courses. BCDs (N = 30) responded to questions about GTA misbehaviors observed in their roles. BCDs were asked why they perceived communicative acts as misbehaviors, how they managed them, and what they did to proactively address them. Utilizing thematic analysis, participants indicated indolence as the most frequently occurring misbehavior, followed by incompetence and offensiveness. Six categories emerged for why behaviors and actions were perceived as misbehaviors. In response to how GTA misbehaviors were managed, six categories emerged. Five categories emerged for how misbehaviors were proactively addressed by BCDs. The findings offer practical and pedagogical solutions for BCDs overseeing and training GTAs.