Winston Smith was torn about writing in his diary. He wanted to warn the future generations about the things that were happening in his present. This was a very big decision he had to make because if caught, he would be punished by death (or at least 25 years working In a forced labored camp).
In this example, we show Emmanuel Goldstein, the party’s chief enemy, who's face appears constantly in the big screens during the "Two Minutes Hate". He basically represents who the man of the society hate the most.
The phrase "Big Brother is watching you" says it all. Big brother represents the government in a way. They watch over every citizen and know their every move. This is a conflict problem because if you want to oppose the government, they will know immediately, and shoot you down.