[1] Inside, wrapped in bright green paper and stamped "Gimbel Brothers-Novelty Samples", was a cardboard box containing a six-inch by three-inch block of hollowed wood about one inch in thickness, packed with a stick of dynamite.

On April 29, Georgia Senator Thomas W. Hardwick, who had co-sponsored the Alien Anarchists Exclusion Act of 1918, received a similarly disguised bomb.

These bombs were much larger than those sent in April, using up to 25 pounds (11 kg) of dynamite[4] and all were wrapped or packaged with heavy metal slugs designed to act as shrapnel.

[5] Addressees included government officials who had endorsed anti-sedition laws and deportation of immigrants suspected of crimes or associated with illegal movements, as well as judges who had sentenced anarchists to prison.

[1][10] Two near-casualties of the same bomb were Assistant Secretary of the Navy Franklin Delano Roosevelt and his wife Eleanor, then living across the street from Palmer.

[1]The flyer was later traced to a print shop operated by two anarchists,[12] typesetter Andrea Salsedo and compositor Roberto Elia, who were both Galleanists according to the later memoirs of other members.

[1] Unable to secure enough evidence for criminal trials, authorities continued to use the Anarchist Exclusion Act and related statutes to deport known Galleanists.

[1] Fueled by labor unrest and the anarchist bombings, and then spurred on by Attorney General A. Mitchell Palmer's attempt to suppress radical and non-radical labor organizations, the response to the bombings was characterized by exaggerated rhetoric, illegal search and seizures, unwarranted arrests and detentions and the deportation of several hundred suspected radicals and anarchists.