One big example was Google's censorship during the 2016 American election. The autocomplete suggestions were wildly different than every other major search engine (DDG, Bing, etc.). Typing "Crooked" into every other search engine would suggest first the completion "Crooked Hillary". Searching on google about the Wikileaks Clinton email server leaks wouldn't yield results that would take you to the links. Most notably, the Chrome browser would try to divert you from the website entirely claiming that wikileaks was unsafe to visit.
I'm sure there are plenty more examples and I'm not attempting to portray any particular motive or larger scheme, but there is boatloads of evidence that Google censors political information and news during American elections. For all the talk of Russian interference, you'd think we'd talk more about Google's interference.