Why did the FCC establish anti-siphoning regulations?

What will be an ideal response?

The FCC, as part of its agenda to serve the public interest, adopted regulations coined anti-siphoning to protect programming found on free (i.e., non cable or satellite) broadcast television. Anti-siphoning rules prevented cable television systems (a.k.a. subscription television) from siphoning off (drawing an audience away) programming for pay cable channels that otherwise would be seen on conventional broadcast television. These anti-siphoning rules stated that only movies no older than three years and sports events not ordinarily seen on television could be cablecast.