The Shirt Tails were a mid-19th century street gang

Gang

A gang is a group of people who, through the organization, formation, and establishment of an assemblage, share a common identity. In current usage it typically denotes a criminal organization or else a criminal affiliation. In early usage, the word gang referred to a group of workmen...

 based in the Five Points slum

Slum

A slum, as defined by United Nations agency UN-HABITAT, is a run-down area of a city characterized by substandard housing and squalor and lacking in tenure security. According to the United Nations, the percentage of urban dwellers living in slums decreased from 47 percent to 37 percent in the...

 in Manhattan

Manhattan

Manhattan is the oldest and the most densely populated of the five boroughs of New York City. Located primarily on the island of Manhattan at the mouth of the Hudson River, the boundaries of the borough are identical to those of New York County, an original county of the state of New York...

, New York

New York

New York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...

, USA, who wore their shirts on the outside of their pants as a form of insignia

Insignia

Insignia or insigne pl -nia or -nias : a symbol or token of personal power, status or office, or of an official body of government or jurisdiction...

 and as a sign of group affiliation. The Shirt Tails were as violent as they were slovenly. They kept their weapons—as many as three or four at a time—concealed beneath their shirts; this discreet measure stands in contrast to competing gangs who flaunted their weapons in order to intimidate.

Never numbering more than a few hundred members, the Shirt Tails, like many other gangs, disappeared shortly before the American Civil War

American Civil War

The American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...

 (although they did participate in a coalition of gangs under the Dead Rabbits

Dead Rabbits

The Dead Rabbits were a gang in New York City in the 1850s, and originally were a part of the Roach Guards. Daniel Cassidy claimed that the name has a second meaning rooted in Irish American vernacular of NYC in 1857 and that the word "Rabbit" is the phonetic corruption of the Irish word ráibéad,...

 and fought against the Bowery Boys

Bowery Boys

The Bowery Boys were a nativist, anti-Catholic, and anti-Irish gang based north of the Five Points district of New York City in the mid-19th century. They were primarily stationed in the Bowery section of New York, which was, at the time, extended north of the Five Points...

 during the New York Draft Riots

New York Draft Riots

The New York City draft riots were violent disturbances in New York City that were the culmination of discontent with new laws passed by Congress to draft men to fight in the ongoing American Civil War. The riots were the largest civil insurrection in American history apart from the Civil War itself...

), with its remaining members dissipating or joining one of the other various gangs.