Usually I'm flying several times every month or two in Europe, and in the last few years I have seen that the situation at security check is worse and worse.
One week ago I had a flight via Frankfurt. I had a connection for 1 hour and 10 minutes; my previous flight was late. I had to run through the airport, and I was stopped at the security check.
There were only two 'doors', one for economy, the other for business and first class. Flying in economy but having short connection, I went to the business class queue. After about 15 minutes in the line I finally got to the control (if I went to economy I suppose it would have been an hour).
There I saw a lot of agents walking around, laughing, speaking to each other, etc. They really don't care that a lot of people can miss their flights. I told one of them that it's not ok. I got the response that if I didn't like something I could call the police. I didn't have time for it as my connection was really short. I ran to my gate and I missed my flight.
After my flight left without me, I had some other problems and forgot about this situation. But for the next time, those security agents, who are they? Airport staff? I don't think that it's police or that they have any relation to the police.
Does somebody know where can I make a complaint next time?
Update 17/12/2017: I'd like to say thank you for all answers and comments, it gives useful experience. Just a small detail: after I missed my flight I spent two days in Frankfurt until I could get another one. That's why I'm so unhappy