"Avoid conversations that are disruptive to the workplace or otherwise violate Google's workplace policies. Managers are expected to address discussions that violate those rules."
A company spokeswoman, Jenn Kaiser, said the guidelines were in response to "a year of increased incivility on our internal platforms."
"We've heard that employees want clearer rules of the road on what's OK to say and what's not," she said in an email.
However, the rules potentially drive a wedge between workers who have cherished the devil-may-care attitude of Google's workplace and the company's management which appears to be striving for a more buttoned-up culture.
Google has also been under pressure to clear up YouTube which some allege is rife with misinformation, particularly heading into the 2020 US presidential election.
In recent weeks, former employees have alleged Google retaliated against them for expressing conservative views and for helping to organise a global walkout.
Google workers are active on internal forums for subgroups representing a wide range of passions, ethnicities and lifestyles. The Silicon Valley search giant also sought to put the kibosh on their overuse or misuse of the online forums, warning that "we will remove particular discussion forums, revoke commenting, viewing, or posting privileges, or take disciplinary action."
As well, Google reminded, leaking classified information is a no-no and could result in disciplinary action or firing.
"Working at Google comes with tremendous responsibility," said Kaiser. "Billions of people rely on us every day for high-quality, reliable information. It's critical that we honor that trust and uphold the integrity of our products and services."