This book explores labor law issues related to other branches of law, in the foreground with greater emphasis on the interdisciplinary study with Corporate Law, in the secondary dimension some relevant and current connections of Labor Law with Sports. The book is organized into four main topics, the first of which deals with the (im)possibility of accumulating subordinate work and the position of director of a public limited company. The next topic is the liability of corporate groups for labor claims, and the third is sports ethics as a duty (obligation) in the employment relationship of sports players and coaches. Lastly, the phenomenon of temporary assignment in the employment contract of sports players. The aim is to provide the reader with new reflections and perspectives to help them in their professional and academic work on such complex legal issues.