International Committee of the Red Cross additional protocol to the Geneva Convention was adopted in 1925 which outlawed the use of suffocating or poisonous gases and biological agents as weapons. Four years later, the original Convention was revised and the second Geneva Convention "relative to the Treatment of Prisoners of War" was established. The events of World War I and the respective activities of the ICRC significantly increased the reputation and authority of the Committee among the international community and led to an extension of its competencies. As early as in 1934, a draft proposal for an additional convention for the protection of the civil population
International Committee of the Red Cross is still considered the greatest failure of the ICRC in its history. After November 1943, the ICRC achieved permission to send parcels to concentration camp detainees with known names and locations. Because the notices of receipt for these parcels were often signed by other inmates, the ICRC managed to register the identities of about 105,000 detainees in the concentration camps and delivered about 1.1 million parcels, primarily to the camps Dachau, Buchenwald, Ravensbrück, and Sachsenhausen. Swiss historian Jean-Claude Favez, who conducted an 8-year review of the Red Cross records, says that even though the Red Cross knew by November 1942