In "Promising Programs for Youth Gang Violence Prevention and
Intervention," James C. Howell (1998)
published a chart showing the names of various gang programs, their
nature, and indicated their level of success.
You can access the chart here. It provides a wealth of useful
information.
It should be remembered that, while a program may be successful
in one community, it may fail in another and visa versa.
Fortunately, Howell has provided potential contact information so
that readers may contact program personnel and inquire more deeply
into the nature of the program offered.