Voted out of Political Party?

As a US American I find that the idea that any political party can kick out another member just because that person doesn't agree with one aspect as INSANE misuse of power. But here in Portugal, a party member that has been accepted into office by the people can then have their membership revoked if they do something the party doesn't agree with. An example is one member that was very prominent and looked up to by many in his party took a job under another party in office. The party he was a member of decided to remove him from his high rank there because they didn't like what he did, even though the reasons were he could make a difference in office, where before he had no standing that can incite change.
There are several factions of many different political types here and they all have a PAID membership into their parties. So in order to be active in their political system, one has to actually have the money to afford dues. And where does this money go I ask? Who knows I am told. See, the political campaigns are paid for by the government, this includes all advertising and  I am sure other aspects I am not aware of.
Whoever set this system up is finding a great way to keep the people here uninterested in their own government and I find this very sick! As I mentioned in my earlier post, people here make barely enough to feed themselves so only the rich can even show interest or be involved in the political aspects. Who are the rich and who do rich people watch after? Business owners and themselves is the answer to both those questions. I know that in the US we have a capitalist view where big business is protected, but at least every citizen has the right to see that and get involved to whatever extent they wish to.
But here? It is no better than the dictatorship they supposedly got rid of. Ironically, the same party that took them out of the dictatorship is the one that made these laws and also the ones that are still in power... interesting huh?

I am sure there are alot more twists to this and if i find out more I will share=)