The Federal Communications Commission ended a grave injustice last fall when it prohibited price-gouging by the private companies that provide interstate telephone service for prison and jail inmates. Thanks to the F.C.C. order, poor families no longer have to choose between paying for basic essentials and speaking to a relative behind bars. Research shows that inmates who keep in touch with their families have a better chance of fitting in back home once released. The commission now needs to be on the lookout for - and crack down on, if necessary - similar abuses involving newer communication technologies like person-to-person video chat, email and voice mail. Before the recent ruling, a 15-minute interstate telephone call from prison could easily cost a family as much as $17. The cost was partly driven by a commission" - a legalized kickback - that telephone companies paid to state corrections departments. The commissions were calculated as a percentage of telephone revenue, or a fixed upfront fee, or a combination of both. The F.C.C. ruled that rates and fees may not include the "commission" payments that providers pay to prisons. It also set a cap for interstate calls: 25 cents a minute for collect calls and 21 cents a minute for prepaid and debit calls. And it required the companies to base charges on the actual costs of providing service.