Motivated by greed, 29 people smuggled black tar heroin and cocaine from Mexico and exploited an untapped suburban market outside Dallas with sometimes deadly consequences, a federal indictment alleges.

The indictment, released Wednesday, painted well-to-do Plano as a haven for heroin pushers who often brought the drugs to Texas by stuffing them into secret compartments in their shoes.The suspects - mostly men in their 20s - are charged with conspiring to distribute cocaine and heroin to the young adults and juveniles in this city of 188,000.