Storm trooper tactics by bands of college students making ideological demands across the country, and immediate preemptive surrender by college administrators — such as at the University of Missouri — bring back memories of the 1960s.

At Harvard, back in 1969, students seized control of the administration building. But, when university president Nathan Pusey called in the police to evict the students, the faculty turned against him, and he resigned.

At least equally disgraceful things happened at Cornell, at Columbia, and on other campuses across the country. But there was one major university that stood up to the campus storm troopers — the University of Chicago.

After student mobs seized control of a campus building, the University of Chicago expelled 42 students and suspended 81 others. Seizing buildings was not nearly as much fun there, nor were outrageous demands met.

Clearly it was not inevitable that academic institutions would follow the path of least resistance. Most of the leading academic institutions have multiple applications for every place available in the student body. Students who are expelled for campus disruptions can easily be replaced by others on the waiting lists.

Why do parents pay big money, often at a considerable sacrifice, to send their children to places where small groups of other students can disrupt their education and poison the whole atmosphere with obligatory conformity to political correctness?

There is no compelling reason for either parents or donors to keep shelling out money to colleges and universities where intolerant professors and student activists impose their ideology on academic institutions. Too often these are campuses with virtually no diversity of viewpoints.

It is not hard to tell which campuses are strongholds of ideological intolerance. One outstanding source of such information is a college guide which rates colleges and universities on their ideological intolerance, giving a red light rating to institutions where such abuses are rampant, a green light where there is freedom of speech and a yellow light for places in between.

That college guide is “Choosing the Right College,” which is by far the best of the college guides for other reasons as well. It gave the University of Missouri a red light rating, and spelled out its problems, two years before Mizzou made headlines this year.

The University of Chicago gets a green light rating as a place where both conservative and liberal students are allowed free rein. Some engineering schools like M.I.T. get green light ratings because their students are too engrossed in their studies to have much time for politics, though Georgia Tech gets a red light rating.

Other red light ratings go to Duke, Vassar, Vanderbilt, Rutgers, Wesleyan and many others. There is also another source of information and ratings of colleges and universities on their degree of freedom of speech. This is a watchdog organization called the Foundation for Individual Rights in Education (FIRE).

If parents and donors start checking out intolerant colleges and universities before deciding where to send their money, the caving in to indoctrinating professors and storm trooper students will no longer be the path of least resistance for academic administrators.