In Fahrenheit 451, the government controls all venues of news and entertainment. It uses this enormous power to target and eliminate private citizens for perceived crimes or simply for disagreeing with its practices, up to the point of setting a violent mechanical hound to kill them.
Although there has been government oversight of communications for a long time, it was only after the terrorist attacks of 9/11 that government spying on domestic soil became a truly contentious subject. The Patriot Act allowed an unprecedented level of intrusion into private lives, and it was extended by President Obama in 2011 for a further four years. Through this and other extensions of government power, many people claim that they have been targeted by the government for censorship and negative propaganda; for example, grass-roots protest movements feel that they are unfairly portrayed by both the media -- who some claim to be strongly influenced by the government -- and the government itself, which releases statements condemning various groups, organizations, and even private citizens. However, with the exception of domestic terrorists and violent protest mobs, the government rarely takes direct action against groups opposed to it, preferring to wage its war in the domain of public opinion. Generally speaking, a person or group must be guilty of a specific crime to be actually arrested or taken into custody by the government; conspiracy theories aside, there is little evidence to show that the U.S. government is actively targeting or abducting innocent people for purpose of censorship or interrogation.
Now that is an interesting and difficult question! I think my answer would be, "sometimes". While The American people are 'free', we are not completely free. It is not a perfect world and we must protect ourselves as a nation. The question is, "How much should we protect ourselves as a nation, and who is a threat?"
Look at the oath of citizenship...
...I will support and defend the Constitution and laws of the United States of America against all enemies, foreign and domestic.
...enemies, foreign and domestic. The Government of America believes that some Americans are its enemy and that it has the right to spy and to check that nobody is a threat. This spying and snooping (or pursuing) has got much worse under the Bush administration with The Patriot Act.
Until recently the most pursued opinion was Communism. Even though The Constitution gives you the right to be a communist, and that there is nothing illegal about communism. The Government has always tried to crush communists. And has locked them up and even executed them. America doesn't like to talk about it, but in the 1950s the American Government went out of control and started attacking its own people. Back then, if you criticised the government at all, they called you a communist (even if you weren't) and made your life very difficult.
But, on the other hand, some American citizens are very dangerous. Gun nuts and far right extremists for example. In 1995, Timothy McViegh blew up a government office and killed 168 people because he believed the American Government was a crypto-socialist plot (he was a loon basically)
And foreign organisation operate secretly inside America and the American government should try to find them (Al Qeada for example) Then there's The Mafia and Drug Cartels etc etc.
It is very hard to say how much 'pursuing' the government should do. Would you like it if they read your emails? (Because they do). Would you like it if they listened to your phonecalls (Because they do). Would you like it if they checked what books you get from the library (Because they do). They can enter your house and leave again without telling you. And, under George Bush, the American Government locked people up for years and tortured them without telling anyone why!!! (in Guantanamo Bay)
The government is sometimes more trusting and sometimes less trusting of its citizens, under Bush, a republican, The American government became very suspicious of its citizens.