The doctrine of frustration of purpose allows athletes to terminate their contracts if the purpose of the contract (i.e., playing for a team in a specific city) is frustrated by an unforeseen event, such as the team's relocation.

Wage theft is the illegal practice of paying workers less than the minimum wage or denying them overtime pay. This can occur in professional sports when athletes are paid below the minimum wage or are not compensated for overtime hours.

Title IX of the Education Amendments of 1972 prohibits discrimination on the basis of sex in federally funded education programs, including athletics. This law has been instrumental in promoting gender equity in sports.

Pay-for-play is the practice of paying athletes to attend a particular college or university, typically in exchange for their commitment to play on the school's athletic teams. This practice is prohibited by the NCAA and other governing bodies of college sports.

Duress is a legal doctrine that allows athletes to challenge the validity of their contracts if they were signed under pressure or coercion. This can include threats, intimidation, or other forms of undue influence.

Doping is the use of performance-enhancing drugs or methods by athletes in order to gain an unfair advantage in competition. This practice is prohibited by most sports organizations and can result in sanctions, including suspensions or bans.

The Anabolic Steroid Control Act of 1990 is a federal law that prohibits the sale, distribution, and possession of anabolic steroids without a prescription. This law was enacted in response to the growing use of anabolic steroids by athletes in professional sports.

Point shaving is the practice of athletes intentionally losing by a certain margin in order to profit from gambling. This practice is illegal and can result in severe penalties, including suspensions or bans.

Constructive discharge is a legal doctrine that allows athletes to terminate their contracts if they are subjected to intolerable working conditions, such as being traded to a new team without their consent. This doctrine is based on the principle that an employer cannot unilaterally change the terms of an employment contract without the employee's consent.

Doping is the use of illegal substances or methods by athletes in order to gain an unfair advantage in competition. This practice is prohibited by most sports organizations and can result in sanctions, including suspensions or bans.

The Anabolic Steroid Control Act of 1990 is a federal law that prohibits the sale, distribution, and possession of anabolic steroids without a prescription. This law was enacted in response to the growing use of anabolic steroids by athletes in professional sports.

Point shaving is the practice of athletes intentionally losing by a certain margin in order to profit from gambling. This practice is illegal and can result in severe penalties, including suspensions or bans.

Constructive discharge is a legal doctrine that allows athletes to terminate their contracts if they are subjected to intolerable working conditions, such as being traded to a new team without their consent. This doctrine is based on the principle that an employer cannot unilaterally change the terms of an employment contract without the employee's consent.

Doping is the use of illegal substances or methods by athletes in order to gain an unfair advantage in competition. This practice is prohibited by most sports organizations and can result in sanctions, including suspensions or bans.

The Anabolic Steroid Control Act of 1990 is a federal law that prohibits the sale, distribution, and possession of anabolic steroids without a prescription. This law was enacted in response to the growing use of anabolic steroids by athletes in professional sports.