Unfortunately, since 9-11-2001, student visas have been increasingly difficult to obtain, particularly if the student has a primary residence in a nation known hostile to the United States or there are difficulties found in background investigation.
Your school will have the forms needed to begin admission of foreign students. Good luck!
Student Visas are issued by the Department of State, and cleared through Homeland Security. If there is any question about the student, the answer may well be no. The 9-11 conspirators all had student visas, and look what they did with them.
Unfortunately leftists of any variety pose a burdensome threat to any nation where they are. That is why these impractical and undisciplinable persons require that we keep an eye on them, and curtail their activities when needed.
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