This corruption isn’t only about big leagues or perhaps the bigger teams but this issue sometimes gets to what most football fans now refers to as home advantage. There are some scenarios where a host club or country gets more favour from officials in charge of the game, in some major tournaments there have been some notable controversial decisions where you start questioning the officials. But then sports especially football now also have it’s business side of it and you never can rule out the possibility of some bias decisions or outcomes in most games.
You clearly don't know anything about the 90s of the last century. In those days (I'll leave it to those who saw them to tell you about the earlier ones, since I didn't) an away game where you were judged unfairly was like a gift, because the alternative was to "kill" your team with a couple of penalties and expulsions. Now the situation at this level has become much better (including because of the Internet and media where everything is recorded and disseminated instantly), but corruption at higher levels has only gotten worse.
