Of all the economic statistics, the unemployment rate is the easiest to understand. The Bureau of Labor Statistics calls or visit a randomly selected sample of Americans, ask them if they are employed, and if they are not, are they looking for a job. While they ask some other questions, those are the basic ones used to determine the widely-publicized unemployment rate. This is not a complicated statistical formula here, subject to all sorts of evil manipulation.
Now, you could argue that the labor participation rate is more useful, or perhaps include people that aren't working as many hours as they'd like, or include people that would like to work, but have given up looking. And they publish those numbers also for any that care to read them, so you can hardly argue that they are a big secret that The Man is trying to hide from you. But it's silly to call any of them "fictitious." And these formulas hardly seem "politically derived." (In fact, the BLS and their counterparts in the GAO are quite fiercely independent; the statisticians are all civil servants that don't really give a *bleep!* what congress or the president want the numbers to end up at.)
Inflation is much the same way; they publish numbers that are perhaps not as useful as we'd like them to be, but they have proven to be pretty free of political whims. It's a drawn-out, very public, process to fiddle with those formulas. If there was a hint that they were bowing to political pressure when calculating them, you'd know about it.