An undated file photo, Ma Barker is shown. Cynthia Mary Roberson is an unemployed mother who Phoenix, Ariz. , police say recently led her 12- and 14-year-old sons and their young friends to commit at least 20 armed robberies and aggravated assaults in the Phoenix area, including the beating of a teenage boy who had nothing more than an orange lollipop. When Phoenix police arrested her with most of the young suspects on May 29, they dubbed Roberson "Ma Barker," the infamous mother who led her four young sons to commit robberies in the early 1900s.