Proclaimers page. 628 - That section is talking about "apostates" and it gives examples of prominent persons in the WT that raised troubles for the Borg.
At the end of the page it states that these ones (apostates, troublemakers) certainly had the right to believe in private whatever they wanted to. But the problem lies in TALKING to others or spreading your ideas that are against the WT Corporation that makes a person guilty of causing divisions.
That paragraph can save you from being disfellowshipped even if you tell elders in their face that the WT is a cult and the Governing Body are deceitful, delusional, conmen. As long as you don't go around talking to others about your contrary beliefs.
Freedom of speech is taken away from the JW members.
There was a brief time circa 1980 (Raymond Franz responsible for this) where the WT sent letters to elders and traveling overseers stating that anyone who holds personal beliefs contrary to the Cult would need to be disfellowshipped even if they didn't promote or talk about those beliefs to others. A copy of this letter is in Crisis of Conscience.
Hope this helps.