History of how the new left got old

In Democracy: A Journal of Ideas, Rich Yeselton tries some ideas about where New Left history came from and where it went to, why Gabriel Kolko had to teach in Canada most of his life, and why a modern libertarian now appropriates his ideas:

Just as some of the young New Left historians like Lynd feared, professionalization—the fear of losing a job in academia or the desire to enjoy the perks that came with holding one—would make such an attack on the most powerful scholars in the field by an aspiring junior faculty member unthinkable today. 

and, perhaps, most oddly, how the New Left historians were marginalized, fired, denied publication, and even prevented from election to their academic organizations... and still ended up taking over the academy somehow.