His criminal record spans nearly a decade of separate violent episodes — a double homicide, an attempted murder, and participation in another killing — each addressed through distinct legal proceedings that ultimately resulted in a death sentence. What makes his case notable in the context of Japanese criminal history is the pattern of recurring violence across multiple years and the delayed legal reckoning that followed as earlier crimes were connected to him only later.

Reichhart carried out more than 3,000 executions over a career spanning the Weimar Republic, the Third Reich, and the immediate postwar period — making him one of the most prolific state executioners in modern European history. His work under the Nazi regime included the killing of political prisoners, resisters, and those condemned under the expanding machinery of wartime capital punishment. After 1945, he was briefly engaged by American occupation authorities before his career finally ended.

A trained anatomist, Hirt used his academic position at Strasbourg to pursue research that required the killing of concentration camp prisoners — both as experimental subjects exposed to mustard gas and as specimens for a projected skeletal collection. The skull collection project, which resulted in the murder of 86 Jewish victims selected for their physical characteristics, represented a convergence of institutional science and genocidal policy that distinguished his case from more straightforwardly administrative perpetrators.

The eldest son of a Sicilian Mafia boss, he came of age within one of the most significant transatlantic heroin networks of the twentieth century, operating across continents as his family navigated exile, extradition, and prosecution. His acquittal at the Pizza Connection Trial — the lone defendant to walk free while his father received 45 years — was followed not by a quiet withdrawal but by years as a fugitive maintaining active ties to Cosa Nostra leadership. The eventual expiration of his Italian sentence through the statute of limitations meant that legal accountability, already partial, ultimately dissolved entirely.

His reign encompassed Japan's imperial expansion across Asia, the atrocities committed by Japanese forces during World War II, and the use of biological and chemical weapons — making the scope of harm carried out under his authority among the most consequential of the twentieth century. The precise nature of his personal involvement in wartime decision-making has been a subject of sustained historical debate, shaped in part by postwar decisions to preserve the imperial institution. He was ultimately shielded from prosecution at the Tokyo Trials, a political calculation that allowed him to reign for another four decades.