Activist hedge fund Jana Partners on Monday accused Zendesk of "hostility" toward viewpoints opposing the company, days after shareholders roundly rejected a planned deal to buy Momentive Global. Jana Partners, which is trying to win four seats on the software firm's board, said Zendesk lead independent director Carl Bass wrote an "expletive-laden e-mail" to research firm 13D Monitor's founder Ken Squire over a note he wrote about Zendesk in early December. The e-mail, heavily redacted to eliminate some words, was the focus of a segment broadcast on Friday by CNBC, where Squire is a contributor.