Engels was a communist who wanted to inspire workers to revolt against the upper classes. knowing this information it is very possible he might have written fabrications and made them seem worse than they actually were.
There are 27 total Amendments in the U.S Constitution and there are 10 in the Bill of Rights. So, basically, 27 in total: 10 of which are in the Bill of Rights.
Hope this helped! Have a great rest of your night and good luck!