Bava Batra 39 - Shabbat August 3, 28 Tamuz

If the original owner protests if a possessor is profiting from the land, but tells the witnesses not to let the possessor know, is the protest effective? The Gemara brings several variations of this type of situation and the rulings of different rabbis in each one, depending on the language used. In front of how many people does one need to protest - two or three? Is it similar to the laws of lashon hara? What is at the root of the debate? Is it sufficient to protest once in the first year or does one need to protest once every three years? What other actions need to be performed in the presence of two people and which require three?