ABC wasn’t the first network to broadcast movies made specifically for television, but it may have made them a fixture on network television for the next 30 years or so.
https://en.m.wikipedia.org/wiki/ABC_Movie_of_the_Week

I remember watching those ABC movies of the week on my brother's little bedroom tv set. I think one was called Love Hate Love that had Lesley Ann Warren in it. Some of those movies were really good.