In "The Outsiders", what is the Greasers code of loyalty? How does it set them apart?

The Greasers are loyal to their own; they are willing to pay virtually any cost to protect those they consider family, including other members of their "gangs".  Because of their loyalty, Greasers are willing to be ostracized by others, especially the Socs.  Members of Greaser gangs refuse to accept any compromise that might threaten their status as a Greaser; they are usually proud to be recognized as members of their group, even though they are fully aware of the negative connotations of the associated stereotypes.