I think you’re right but would also add the nascent tech worker organization during the same period. I think many of these guys were bitterly resentful of the idea of workers trying to unionize or otherwise negotiate on a more even level, and that made the general political concerns very personal.
Yea, no matter how left-leaning the business owners are, the second that labor gets even a smidgen of power, they all suddenly turn into Ronald Reagans.