1. Sign a petition: https://www.change.org/p/educationists-say-no-to-police-action-in-jnu-and-all-universities
2. Support Devika's petition to have John Oliver cover this: http://talk.hbo.com/t5/Last-Week-Tonight-with-John/Topic-suggestion-Jawaharlal-Nehru-University-INDIA-State-assault/m-p/508880#U508880
you will need to register to do so. Please do!
3. Write to news sources in India (there are dozens of English language newspapers in the country, and many dozens more alternative press sites)
4. Organize your Department and Campus to be in solidarity with JNU and Indian students and send to kafila.org. See below for an example
5. Write to your local newspapers. See my example. It hasn't been published but I hope it will be.
7. Remain informed and see how it is linked to other issues you care about.