Everyone has heard of an employer who stole from their employees, such as retailers who pay them straight commission to work in the showroom, but intellectual property theft gets less attention because it's still legal. Technically, if a company hires someone as an employee then they're allowed to take all of his or her intellectual property during his or her employment, and then eliminate the position. California's labor laws don't penalize them for it. Obviously it's a major con job that deserves legal action, both in terms of compensatory damages and penalty fees.
A few employers take intellectual property from candidates during job interviews, and so they never pay a dime for it. There are employers who give candidates a job offer, make them work, and then say that they never hired them.