if they snuck it in then you would not have heard of it
if it were in the curriculim mandated by the state then it would be in the minutes you already had
if you were a liberal then you might have some bias which could make it hard to spot
Someone needs to do some better research to show you where and how organizations like this one did what they did becuse right now too much is conjecture. Which does not mean that you might not be like the proverbial monkeys
I view this issue from the inside. I taught in the public schools for 38 years, and yet, never heard of the "rethinking schools" organization. I never saw, used, or even heard of their math materials. We had a math book that we were supposed to cover, with only so much classroom time to do it. Bringing in something else was out of the question.
Now, if adding fractions, doing long division, identifying types of triangles, and learning the difference between variables and constants is "liberal indoctrination", then I suppose we were indoctrinating them.