The illegals take jobs from Californians by undercutting. They have single handedly almost taken over entire construction type and gardening jobs, fast food jobs, cleaning lady and nanny jobs, by undercutting Americans, putting lots of guys out of work.
They are able do this by living 12 people to a 2 bedroom apartment, not paying for auto insurance, and having their entire medical care paid for by taxpayers, plus getting checks from the government to take care of their kids. Pretty good deal for them, bad deal for America.