IPA: //ˈɡæŋstərɪzəm//
KK: /ˈɡæŋstərɪzəm/
The actions or conduct typical of a gangster, often involving crime or illegal activities.
The film depicted the rise of gangsterism in the 1920s.
Gangsterism is formed from "gangster" (from the word "gang" meaning a group of people, and the suffix "-ster" indicating a person associated with a particular activity) and the suffix "-ism" (meaning a practice or system). The term refers to the practices or behaviors associated with gangsters or organized crime.
Think of a 'gang' as a group of people involved in certain activities, and '-ism' as a system or practice. This helps you remember that 'gangsterism' refers to the practices associated with gangsters.