By referencing two sources provide a definition for the concept "gang"

Source 1: The U.S. Department of Justice defines a gang as a group of individuals who have come together to engage in criminal activity. Gangs are typically characterized by their shared identity, which can be based on factors such as neighborhood, ethnicity, or common interests. They often have a hierarchical structure, with leaders who coordinate criminal operations and dictate rules and behavior within the gang. Gangs may engage in various criminal activities, including drug trafficking, theft, extortion, assault, and even murder.

Source 2: The National Institute of Justice defines a gang as a group of three or more individuals who share a common identity and engage in criminal activities. Gangs usually have a recognizable name and designated territories where they operate. They may display symbols or colors to mark their identity and differentiate themselves from rival gangs. Additionally, gangs often exhibit a sense of loyalty and solidarity among their members, which can manifest through rituals, codes, and initiation processes. Gangs are known to engage in violence, intimidation, and other criminal behaviors to protect their reputation and assert control over their territory.

Combining the information provided by these sources, we can define a gang as a group of individuals, typically numbering three or more, who share a common identity and engage in criminal activities. Gangs often display a recognizable name, symbols, or colors and may have designated territories. They generally operate under a hierarchical structure and exhibit a sense of loyalty and solidarity among their members. The criminal activities associated with gangs can range from drug trafficking and theft to assault and murder.

Source 1: The International Association of Chiefs of Police (IACP)

According to the IACP, a gang is defined as a "group of three or more individuals who engage in criminal activity and identify themselves with a common name, sign, or symbol."

Source 2: The National Institute of Justice (NIJ)
The NIJ defines a gang as a "group or association of three or more individuals who share a common identity, often employ a sense of territoriality and engage in criminal activity."

Combining these definitions, we can define a gang as a group of three or more individuals who identify themselves with a common name, sign, or symbol, share a common identity, often exhibit territorial behavior, and engage in criminal activity.

To provide a definition for the concept of "gang," I can reference two reliable sources: Oxford English Dictionary (OED) and Merriam-Webster.

According to the Oxford English Dictionary, a gang is "a group of people, especially young people, who regularly associate together, especially for criminal or other antisocial purposes." You can find this definition by accessing the Oxford English Dictionary through its official website or by referring to a print edition of the dictionary.

Merriam-Webster, another reputable source, defines a gang as "a group of persons working together or a group of persons associated for some criminal or other antisocial purpose." To find this definition, you can visit the official Merriam-Webster website or consult a physical copy of their dictionary.

By referencing these two sources, you can obtain reliable definitions of the concept of "gang."