 However, due to the Smiths' controlling interest in Glencairn, Sinclair effectively had a duopoly in Baltimore – and had all but emasculated its principal rival.Glencairn eventually bought ten more stations, and Sinclair controlled all their operations via local marketing agreements.Due to Glencairn's financial structure (the Smiths eventually bought 97% of Glencairn's stock), Sinclair effectively had duopolies in all 11 markets in violation of the FCC media ownership rules at the time.