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Grove Press is perhaps best remembered for their landmark 1st Amendment rights case based around the obscenity challenge to Lady Chatterley's Lover, by D.H. Lawrence. (They also successfully defended in court their printings of Tropic of Cancer, by Henry Miller and Naked Lunch, by William Burroughs.)
Grove put out several paperback labels, including one under its own name, plus Black Cat, Evergreen and Venus Library. Those were all considered "Alternative" books, verging on "adults only." Zebra was perhaps their only "mainstream" label. There were at least a few "Grove Press Zebra" books printed.
I can find very little information about Zebra. One reason might have been that in 1970 (about the timeframe Zebra was published), owner Barney Rosset took Grove public. There were only 150 employees in the organization, and there was a big push to organize. Rosset was staunchly anti-union, and a bitter battle finally ended with the employees voting down organization. Rosset, however, fired almost half the staff following the vote, and the company foundered for awhile as a result.
Sometime in the past few decades, the Zebra name was sold to Kensington Books, along with Pinnacle and Citadel. I do not know if there were mergers beforehand.
(Scan above Courtesy of Kenneth R. Johnson)
This page was updated in June, 2012