Michael Mozina said:
Arp's problem was not that he went against standard models, his problem was that he was publishing crap, and taking up telescope time with unproductive studies. I know that it's hard for you to distinguish between a conspiracy and recognition of inferior work, but it's real. Physicists LOVE game-changers. But there are damned few of those, and most claims are mistakes or delusions.
I think it's important to note that some of Arp's published work is first class, especially his early papers.
And his early papers on quasars (QSOs, etc) are quite interesting ... at the time, very little was known of these fascinating objects, and ideas on their nature many and varied.
However, it quickly became apparent that Arp's analyses were weak, especially the statistical components (he seemed, and still seems, extraordinarily sensitive to finding patterns 'by eye', but almost blind to testing his findings in an objective, independently verifiable way), and by the mid 1970s there was little scientific merit to much of what he continued to publish.
Regarding his career: AFAIK, he moved to Germany, and has (or had, I suspect he's retired by now) a quite cushy position with the Max Planck Institute (for those who don't know: this is one of the 'to die for' employers, if you are keen on astrophysics), so why so many conspiracy nuts and cranks think he's some kind of martyr is really odd ...
Oh, and the 'telescope time' thing is interesting too: no one denies that the proposals for time on the leading astronomy facilities (both ground- and space-based) exceeds the time available (usually by a factor of several), so there has to be a process for allocating time. It follows that a professional astronomer can reasonably expect to have a significant proportion of his proposals turned down (Jim Gunn and John Bahcall may be exceptions); why should Arp be different? One thing I find fascinating is when you ask ardent Arp fans, or even proponents of crank science (such as "EU theory"), what they'd do if they had unlimited access to the world's best facilities, you get either silence or gibberish ("I'd give it to Arp" is perhaps the worst cop-out)!