Bias in hiring academics?

I heard similar things in Kolkata but this was a bit of surprise. Ftom An Interview with Michael Perelman:
"The young economists, looking for jobs, are the ones that require support and solidarity. For example, a young person expressing the ideas found in this book would have difficulty finding a job. I believe that more than 20 years have passed since any known leftist economist has been hired by an Ivy League university."
But having tenure seems to help. James Galbraith seems to speak freely here:
"I have an answer to that. Let Ben Bernanke come over to our side. Let him acknowledge what is obvious: the instability of capitalism, the irresponsibility of speculators, the necessity of regulation, the imperative of intervention. Let him admit the intellectual victory of John Maynard Keynes, of John Kenneth Galbraith, of Hyman Minsky. Let him take those dusty tomes off the shelf, and broaden his reading. I could even send him a paper or two.
P.S. Happy May Day.