The minister's continuation in office had become "untenable" due to his alleged derogatory remarks insulting womanhood, Mr Chennithala said and added Mr Yechury should intervene to uphold the party's well-declared positions on democratic values, women's empowerment, public decency and decorum.
The minister has also been making "intimidating statements against government officials who have been executing their duty in a committed manner to evict encroachments on government property," he added.
Mr Mani's adverse remarks against women constitute a serious offence under the relevant provisions of the IPC, he said.
"The minister's intimidating statement against government officials also crossed the well-laid time-tested procedures relating to the conduct of ministers and officials. The minister's language style has been offensive, if not abusive," the letter said.