The Phoenix law office of Steptoe & Johnson LLP is hosting a forum for businesses this week related to immigration laws and new state and federal programs that punish employers that hire illegal immigrants. The conference will detail the Arizona employer sanctions law set to go into effect in January, as well as tougher federal enforcement and penalties against businesses that hire undocumented workers. The event will be held Thursday morning at the Ritz-Carlton hotel in Phoenix. A number of law firms have held similar immigration seminars for business clients and potential clients worries about the immigration issue.