Some governmental agencies lie more than others. Look at what happened in Afghanistan... our military and intelligences agencies continually lied and wildly exaggerated our successes there for 20 yrs. There was some progress made as far as women's rights and education however no amount of U.S. military hubris or prowess could overcome the corruption and incompetence of the Afghan gov't, military and police and the lack of nationalistic identity and will of the Afghan people. The worst lies are the lies we tell ourselves and in Afghanistan it could not be more relevant.
I believe our health agencies (NIH, FDA, CDC) are generally reliable and truthful however mistakes and incompetence happen occasionally. Fortunately there is a system of peer reviewed studies and data that must be published and scrutinized prior to any agency decisions that keeps them in check. The scientific community outside the NIH has far more expertise than those inside. I believe the scientific community generally agrees with FDA and CDC decisions and actions however there are occasional disagreements...i.e. Biogen's aducanumab approval & Fauci's mask controversy.
I believe Fauci's statements on masks were misleading and confusing however the controversy is overblown IMO. Fauci should have stuck to the science instead of trying to manipulate people's attitudes and reactions to the pandemic. The CDC's response in the initial weeks was thoroughly bungled IMO.
I view the health agencies as similar to the FAA. In the early days plane crashes were common place however over the years after many air disasters, lessons were learned and regulations were implemented to correct mistakes by the aviation industry in the manufacture and operation of air planes. The NIH, FDA and CDC have followed a similar track. They're not perfect but much better than the past.
Corporations lie occasionally but there is so much oversight and so many regulations that lies are the exception rather than the rule. Occasionally a Theranos(Elizabeth Holmes) or Nikola(Trevor Milton) will come along however with whistleblower laws and the diligence of the shorts the truth will eventually come out. The biggest lies by corporations by far are those propagated through advertising.
The media is by far the biggest source of lies and misinformation IMO. There are 2 parts to what I mean by "media". There is mainstream media and social media. Both are protected by the 1st Amendment which gives them almost free reign to say whatever they want. Because mainstream media is supported by advertisers and in many cases has shareholders, there is much more pressure and incentive for TV, radio and print publications to be honest with their viewers. But some mainstream media have figured out that lying is good for ratings which allows them to jack up their advertising rates. Fox, OAN and Newsmax are examples of going overboard on that business model and now may end up paying billions to Dominion. Lies are protected speech however lies that result in economic harm or loss of revenues and/or profits can be remedied through the courts.
Social media is the wild card and a much bigger propagator of lies and misinformation than mainstream media...no contest. It's all about eyeballs and mouse clicks. It's a tough problem but I support Twitter, Facebook and Youtube for trying to get a handle on what are obviously outright lies and misinformation about COVID. the 2020 election etc. As public businesses they have the right to police their customers. Some may call it censorship but what people forget is that the 1st amendment only protects individuals from government or state censorship and the social media companies are well within their rights to take such actions as they see fit. The social media companies are not restricting anyone's speech. People still have the right to say whatever they want...they just don't have the right to use a megaphone.
The link below is a pretty good resource I use to check the political bias and factual accuracy of mainstream media. It's a good tool that helps me sort out what may be fact or fiction which is sometimes hard to tell.
News 
Market Data 
Discover 
