Final answer:
The question about a specific mode of serial killer classification being trashed appears to be based on misinformation; no such specific mode has been commonly recognized as trashed in the field.
Step-by-step explanation:
The mode of classifying serial killers that was trashed has not been explicitly identified in contemporary or historical criminology discourse as per the provided reference. However, in addressing the question, one may draw a parallel to how categories in Soviet propaganda were used to manipulate and demonize certain populations. This process of dehumanization has no direct link to modern serial killer classification. Classifications for serial killers have been refined over time with the FBI moving from the organized/disorganized dichotomy to a more nuanced approach considering many behavioral, motivational, and psychological factors.