Plot Against Herbert Hoover

Background

At the time, Herbert Hoover was listed as president-elect. The record is categorized as foiled or abandoned plot with a medium confidence level.

Event details

The reported method was bomb plot. Foiled before attack.

Aftermath

The alleged plot was discovered by Argentine and U.S. security officials during Hoover's post-election goodwill tour of Latin America in late 1928, and no attack occurred. Hoover completed his visit to Argentina without incident, and his tour was widely hailed as a diplomatic success. The alleged conspirators, described as Argentine anarchists, were reportedly detained by local authorities, though the specifics of any legal proceedings were not widely reported in the United States. The incident underscored the security challenges of what was the first major presidential-level international goodwill tour and the importance of coordinating with foreign governments. It remained a minor footnote in Hoover's biography and did not disrupt U.S.-Argentine relations.

Historical significance

The alleged plot against Hoover during his 1928 Latin American goodwill tour represents one of the few documented foreign-soil threats against an American president-elect and highlights the security vulnerabilities inherent in early 20th-century international presidential travel. The tour itself was historically significant as a post-election diplomatic initiative meant to improve hemispheric relations, making the security failure all the more alarming for its potential diplomatic fallout. The incident contributed to the gradual development of advance security protocols for overseas presidential travel, a framework that would be formalized more thoroughly in subsequent decades. It remains one of the lesser-studied episodes in presidential security history.

Sources

• Herbert Hoover — Good Will Tour of Latin America — Wikipedia contributors
• List of United States presidential assassination attempts and plots — Wikipedia contributors