Unfair business practices?

I work for a family owned franchise in Washington state. I work as a sales person, & was recently moved from salary + commission to commission only. I have been struggling to make money due to the downturn of the economy and change of business modle. I found out that commissions were paid to another sales person on the accounts and connections that I established. My "protected accounts" were changed and commissions awarded to a new "territory manager" even though the employer previously agreed that the accounts in the new managers territory would remain mine. I have lost several commissions this way. Other associates have said that the family will often re-direct business and change and take accounts over for their benefit. Meanwhile the owner is berating me for not making sales. Help?