  The search for the origin of cosmic rays is a quest of almost a hundred
years. A recent theoretical proposal gives quantitative predictions, which can
be tested with data. Specifically, it has been suggested, that all cosmic rays
can be attributed to just three source sites: i) supernova explosions into the
interstellar medium, ii) supernova explosions into a stellar wind, and iii)
powerful radiogalaxies. The cosmic rays from any extragalactic source suffer
from interaction with the microwave background, leading to the
Greisen-Zatsepin-Kuzmin cutoff. While the particle energies, the spectrum and
the chemical composition of cosmic rays over the energy range from about GeV to
about 100 EeV can be interpreted in the theory, there are exciting measurements
now: New measurements show that there are cosmic ray events beyond the
Greisen-Zatsepin-Kuzmin cutoff. We discuss here possible sources, and
specifically ask whether powerful radiogalaxies are suitable candidates. The
basic concepts used here are the minimal hypothesis that the intergalactic
magnetic field is given by the galaxy distribution, and the observation that
radio galaxies also cluster like galaxies.
