Before revision:  Existing approaches to detect malicious campaigns make strict assumptions about coordinated behaviours, such as malicious accounts perform synchronized actions or share features assumed to be indicative of coordination. Others require part of the malicious accounts in the campaign to be revealed in order to detect the rest.
After revision:  Existing approaches to detect malicious campaigns make strict assumptions about coordinated behaviours, or require part of the malicious accounts in the campaign to be revealed in order to detect the rest.