Melissa Harris-Perry, the departing liberal MSNBC host who announced last week she was boycotting her own weekend show, went on social media Tuesday to complain about a "culture of fear" at the cable news channel.

"A few apologies," Harris-Perry said on Twitter to her 435,000 followers. She name-checked three former MSNBC on-air personalities who were terminated from the channel in recent years: Martin Bashir, Toure Neblett and Karen Finney.

"I am sorry for and ashamed of my earlier silence. I gave into [a] culture of fear at MSNBC," Harris-Perry said.

Bashir was let go in 2013 after he made a crude comment about former Republican vice presidential nominee Sarah Palin. Neblett was also taken off the air last summer when executives began moving MSNBC away from liberal commentary and toward hard news.

In another tweet, Harris-Perry targeted two executives at MSNBC, suggesting that they head leaked her internal emails to them to the press last week. "[I]f I cc u on email Tue[sday] & it's leaked to press on Friday maybe I'm not the unpredictable one," she said, with an apparent reference to MSNBC President Phil Griffin and Vice President Yvette Miley.