During his tenure as Grand Sachem, Boss Croker garnered a reputation for corruption and ruthlessness and was frequently the subject of investigations.

As his power waned following the 1900 and 1901 elections, Croker resigned his position and returned to Ireland, where he spent the rest of his life.

[5] Upon arrival in the United States, Eyre Coote Croker was without a profession, but he had a general knowledge of horses and soon became a veterinary surgeon.

Croker dropped out of school at age twelve or thirteen to become an apprentice machinist in the Harlem Railroad machine shops.

John Kelly, the new Tammany Hall boss, attended the trial, and Croker was freed after the jury was undecided.

After the death of John Kelly, Croker became the leader of Tammany Hall and for some time almost completely controlled that organization.

As head of Tammany, Croker received bribe money from the owners of brothels, saloons and illegal gambling dens.

Croker survived Charles Henry Parkhurst's attacks on Tammany Hall's corruption and became a wealthy man.

[9] After Croker's failure to carry the city in the 1900 presidential election and the defeat of his mayoralty candidate, Edward M. Shepard in 1901, he resigned from his position of leadership in Tammany and was succeeded by Lewis Nixon.

[10] An associate described Croker as having "[a] strong frame, a deep chest, a short neck and a pair of hard fists....

He speaks in monosyllables, [and] commands a vocabulary that appears to be limited to about three hundred words...."[6] Croker operated a stable of thoroughbred racehorses in the United States in partnership with Mike Dwyer.

In January 1895, they sent a stable of horses to England under the care of trainer Hardy Campbell Jr. and jockey Willie Simms.

[1] His funeral, celebrated by South African bishop William Miller, drew some of Dublin's most eminent citizens; the pallbearers were Arthur Griffith, the President of Dáil Éireann; Laurence O'Neill, the Lord Mayor of Dublin; Oliver St. John Gogarty; Joseph MacDonagh; A.H. Flauley, of Chicago; and J.E.

[13] In 1927, J. J. Walsh claimed that, just before his death, Croker had accepted the Provisional Government's invitation to stand in Dublin County in the imminent Irish election.