Nieznani Sprawcy are part of the organised supporter culture around Legia Warszawa and are widely associated with match displays and large-scale choreography.
In May 2026, Legia.net described the group in connection with its symbolic 20-year anniversary and its long-running role in preparing stadium presentations.
Global Fan Voice does not show an exact founding date because the current source supports the anniversary milestone more strongly than a precise legal or organisational start date.