The Central Civil Services (Conduct) Rules, 1964

7. DEMONSTRATION AND STRIKES:

No Government servant shall -

(i) engage himself or participate in any demonstration which is prejudicial to the interests of the sovereignty and integrity of India, the security of the state, friendly relations with foreign States, public order, decency or morality, or which involves contempt of court, defamation or incitement to an offence, or

(ii) resort to or in any way abet any form of strike or coercion or physical duress in connection with any matter pertaining to his service or the service of any other Government servant.

Government of India Decisions:

(1) Restrictions or government servants who are office-bearers of service associations, in dealing in their official capacity with matters connected with those associations [MHA OM No. 24/1/60-Ests. (B) dated 25.01.1960]
(2) ‘Strikes’-interpretation of what constitutes a strike under the Conduct Rules [MHA OM No. 25/23/66-Ests. (A) dated 09.12.1966]
(3) Participation in "Gheraos" by Central Government servants – [MHA OM No. 25/S11/67-Estt. (A) dated 13.04.1967]
(3A) File a complaint [MHA OM No. 25/S.11/67-Estt. (A) dated 15.04.1967]
(4) Display of posters and other notices – please see Government of India decision No. (10) under Rule 3]
(5) Demonstrations in the vicinity/neighborhood of Government Offices [DP&AR OM No. 25/6/73-Estt. (A) dated 09.03.1973]