Acamedic suppression in the USA...usually involves "left thinkers"...people who are a little too crital or liberal in their views. It happens through channels where you don't ever hear about it, such as the peer review process or in science through publishers and advertisers rejecting scientific articles for publication. I'd be willing to bet that there are thousands of scientific and scholarly articles rejected every year that deal with alternative energy, especially free energy, because they are at odds with the status quo (coal, oil, natural gas industries and US foreign policy).
Here are a few cases...
http://www.bmartin.cc/pubs/88psa/88psa_Frumkin.html
Also, I'm sure every scientist and academic that believes in intelligent design would agree that suppression is an issue. If I'm not mistaken, it may actually be illegal to teach intelligent design in publicly funded institutions. I don't necessarily believe in intelligent design, but it's easy to see this is suppression on a massive scale.
Here are a few cases...
http://www.bmartin.cc/pubs/88psa/88psa_Frumkin.html
Also, I'm sure every scientist and academic that believes in intelligent design would agree that suppression is an issue. If I'm not mistaken, it may actually be illegal to teach intelligent design in publicly funded institutions. I don't necessarily believe in intelligent design, but it's easy to see this is suppression on a massive scale.