 In all , 16 bombs — which injured 23 people and killed three — were attributed to Kaczynski . While the devices varied widely through the years , all but the first few contained the initials " FC . " Inside his bombs , certain parts carried the inscription " FC , " which Kaczynski later asserted stood for " Freedom Club . " Latent fingerprints on some of the devices did not match the fingerprints found on letters attributed to Kaczynski . As stated in the " Additional Findings " section of the FBI affidavit ( where a balanced listing of other uncorrelated evidence and contrary determinations also appeared ) : 
