Русско-англо-русский юридический словарь

The English requirement for consideration does not apply in Scotland, so it is possible to have a gratuitous contract, i.e. a contract where only one of the parties comes under any duties to the other (e.g. a contract to perform services for no consideration). If, however, consideration is given, as for example in a sales contract, the contract is said to be onerous. (Wikipedia)

Breach of contract is a legal cause of action in which a binding agreement or bargained-for exchange is not honored by one or more of the parties to the contract by non-performance or interference with the other party's performance. If the party does not fulfill his contractual promise, or has given information to the other party that he will not perform his duty as mentioned in the contract or if by his action and conduct he seems to be unable to perform the contract, he is said to breach the contract. (Wikipedia)

Border controls are measures taken by a country to monitor or regulate its borders. Border controls are put in place to control the movement of people, animals and goods into as well as out of a country. Specialized government agencies are usually created to perform border controls. Such agencies may perform various functions such as customs, immigration, security, quarantine, beside other functions. (Wikipedia)

The employment relationship is the legal link between employers and employees. It exists when a person performs work or services under certain conditions in return for remuneration. (Official website of the International Labour Organization (www.ilo.org))