Asian gangs are expanding and becoming more visible. The groups have typically been overshadowed by larger street gangs, like Crips or Bloods. As police investigate Wednesday’s firebombing of the home on N. Banks police are learning more about the gang that's reportedly behind the attack. The homeowner claims a Hmong gang is trying to recruit his sons through intimidation. They've vandalized cars, sprayed the house with bullets and now the violence. No one was hurt in the attack. "I think they are trying to scare me or give up and join them," he said. Threats and violence are common gang recruitment tactic. "That is that the way these gangs often work, is you join us or else, you are either with us or against us and using those intimidation factors brings other people in," Portland State sociologist Randy Blazak said. Experts say, Asian gangs often go unnoticed. Unlike other street gangs, they tend to prey on their own community. "Its a sort of insular ...