The u. s. steel case of 1920 and the alcoa case of 1945 dealt with which antitrust question?

The correct answer is Should an industry be judged by its behavior or by its structure?

The question at hand was should monopolies and trusts be allowed to exist if they are not exploiting the people and ruining the market, or should they be banned even if they behave properly and run businesses that are good for the economy and people. This was a major idea in both of the cases and inspired many anti trust acts.