How did the early church fathers accepting the doctrine of the Trinity regard Christians who didn't accept the doctrine of the Trinity?

How did the early church fathers accepting the doctrine of the Trinity regard Christians who didn't accept the doctrine of the Trinity? By early I'm mean 2nd century or before. Constantine changes the picture of government interference. My understanding is they accepted them as Christians but heretical (a schism). But I'm not familiar enough with the church fathers to answer this. Related: https://christianity.stackexchange.com/questions/107892/as-a-jewish-believer-in-jesus-i-view-him-as-my-messiah-the-son-of-god-but-not