Government intervention definitely creates monopolies, like in the case of telecom companies or pharmaceuticals.

But it seems many aspects of capitalism lend themselves to winner take all mechanics, resulting in large companies (airliners and telecoms and entertainment companies) constantly merging and reducing competition. So without the FTC, we might have even more monopolies. Without these laws, Microsoft would be the only PC company (MS bailed apple out to keep some "competition" around) and Intel would be the only manufacturer of CPUs (likewise for Intel and AMD).