Title of movie where protestors occupy a mass exposure research building

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Trying to ID a movie, time-wise somewhere between The Blob and What’s So Bad About Feeling Good. Protestors occupy a test building where animals are to be exposed, en masses, to either a nerve agent or possibly radiation. The walls are glass(?) louvers that ooen up to let whatever it is blow through the building. Their intent is for the researchers to find their bodies after the experiment.

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