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Also, a memorial bust monument of Ambrose was erected in his honor and originally unveiled at Battery Park in 1936 by his family and Mayor Fiorello La Guardia.
The only authoritative voice that opposed Anslinger's campaign against cannabis was the one of the Mayor of New York Fiorello La Guardia, who appointed in 1938 a commission of investigation, and in 1944 strongly objected to Anslinger's campaign with the famous La Guardia Committee.
Although he had been forced into retirement after having a lawyer-politician removed from the premises after interrupting an interrogation, he was brought back by reform Mayor Fiorello La Guardia in the early 1930s as deputy commissioner of the Department of Markets in an attempt to investigate racketeering in New York's produce industry.