Not without prior government permission under Rule 19. The employee must first seek permission from the competent authority. If permission is granted, they may file a defamation suit. Acting without permission is a conduct violation, even if the defamation suit itself would be legitimate.
Source: CCS-CONDUCT Rule 29
When must the Annual Property Return be filed?
Can service associations organise peaceful marches to submit memorandums?
Can a government servant lose their job solely because they married without permission?
What permission is needed to sell ancestral property?
Can a government servant marry a foreign national?
This answer is for informational purposes only and does not constitute legal advice. Always refer to the original rules and consult competent authorities for official interpretation.