Fairness Doctrine
The Fairness Doctrine mandated broadcast networks devote time to contrasting views on issues of public importance. Congress backed the policy in 1954 and by the 1970s the FCC called the doctrine the “single most important requirement of operation in the public interest – the sine qua non for grant of a renewal of license.
https://www.reaganlibrary.gov/archives/topic-guide/fairness-doctrine
Might be time for the FCC to bring this one back