1. To assume a position of power over a person, group, or thing. The terms of the treaty bring our country under the king's control. I think you'll have a hard time bringing the department under your control—they're very loyal to their old boss.

2. To assert control over someone or something, especially to limit their or its actions or potentially negative effects. In this usage, a pronoun does not need to be used between "under" and "control." Thankfully, the teacher was able to bring all the screaming kids under control.