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A gentlemen`s agreement, or gentleman`s agreement, is an informal and legally non-binding agreement between two or more parties. It is usually oral, but it can be written or simply understood as part of a tacit agreement by convention or by mutually beneficial label. The essence of a gentlemen`s agreement is that it depends on the honour of the parties for its achievement, rather than being enforceable in one way or another. It differs from a legal agreement or a contract. Until Jackie Robinson was hired by the Brooklyn Dodgers in 1946, a gentlemen`s agreement ensured that African-American players were excluded from organized baseball.  A report by the U.S. House of Representatives, detailing its investigation of the United States Steel Corporation, stated that in the 1890s there were two types of loose associations or consolidations between steel and ferrous interests in which the various groups held ownership, as well as a high degree of independence: the « pool » and the « gentleman`s agreement. »  The latter type lacked a formal organisation to regulate production or prices or forfeiture rules in the event of infringement.  The effectiveness of the agreement relied on members to meet informal commitments.  Gentlemen`s agreements were a widespread discriminatory tactic, which would have been more common than restrictive alliances to preserve the homogeneity of upper-class neighborhoods and suburbs in the United States.  The nature of these agreements made it extremely difficult to prove or follow them, and they were long after the U.S. Supreme Court decisions in Shelley/. Kraemer and Barrows v. Jackson.
 A source indicates that the gentlemen`s agreements are « probably still in place » but that their use has declined sharply.  In English contract law, for an agreement to be binding, legal relations must be considered; but in commercial transactions (i.e. agreements that do not exist between family members or friends), there is a legal presumption of « intent to establish legal relations ». In the 1925 case of Rose and Frank Co. v. JR Crompton – Bros Ltd., however, the House of Lords found that the phrase » « This regulation is not … a formal or legal agreement … is only a record of the parties` intention « was sufficient to rebut this presumption.
 A gentleman`s agreement, defined at the beginning of the 20th century as « an agreement between gentlemen who looks at price control, » was described by one source as the loosest form of a « pool. »  Such agreements have been declared in all industrial sectors and are numerous in the steel and steel industry.  Gentlemen`s agreements have come to regulate international activities such as the coordination of monetary or trade policy.  According to Edmund Osmasczyk in the United Nations Encyclopedia and International Agreements, it is also defined as « an international term for an oral and unwritten but fully valid agreement. »  This type of agreement may allow a nation to circumvent national legal requirements to enter into a formal contract or it may be useful for a government to want to enter into a secret agreement that does not engage the next government.  According to another author, all international agreements are gentlemen`s agreements because, just before the war, they are all unenforceable.  Osmaczyk noted that there was a difference between gentlemen`s open agreements and secret diplomatic agreements.  In the United States, in 1890, the prohibition of gentlemen`s agreements was introduced in interstate trade relations because the secrecy of these agreements was beyond anyone`s control.  An intense anti-Japanese atmosphere developed on the west coast.