There are always powerful people, but as the mighty rise they also fall.
There are conspiracies and people hold meetings to agree ways to deal with things.
Take the UN, Nato and other organisational blocks. The exist and they fail and succeed to varying degrees.
The core idea about Jews ruling the world, and a group who have secretly pulled the strings to everything is simply a lie.
Problems in society appear, and usefull pressure groups always are needed to help sort things out.
If you have no groups you end up with Somalia, Democratic Republic of the Congo, Zimbawe, Afghanistan all failed states to a greater or lesser extent.
Groups like ISIS on the left and the right like conspiracies because it gives them an enemy to hate, though ethical and emotional ideas do pose a real risk and cost lives, but they are often not organised, but used as propoganda to fuel war and conflict.
So you must be wary of anyone who claims there is a successful conspiracy, because other than the obvious simple ones, they all fail.