How were the greasers established the rules?

The Greasers established their rules through a combination of shared experiences and a strong sense of loyalty among members. Often stemming from their socio-economic backgrounds, they created a code of conduct that emphasized brotherhood, respect, and protection of one another. These informal guidelines were enforced through mutual agreement and reinforced by the consequences of betrayal or disrespect within their group. Their rules served to create a sense of identity and solidarity in a world where they often faced discrimination and violence.