The European Parliament represents the interests of all citizens of the European Union. Every country that is a member of the EU send deputies to the European Parliament.
Each ordinance and each policy which is being prepared by the European Commission must be approved by the parliament.
On the side www.votewatch.eu one can see, in which voting which member of the parliament voted for what. It is interesting to see that in the vote on the suspension of the SWIFT agreement with the U.S. after the NSA scandal, 49% voted against it.
This site may simplifies the decision which party you should vote for in the elections to the European Parliament.