Is Arabe Unido the Dirtiest Team in the CONCACAF Champions League?

Over the last two years I've developed an overwhelming hatred of Panama's Arabe Unido. The strategy in their 2009-10 home leg against Houston consisted of two-footed tackles and overall hackery. This year's performance against Real Salt Lake alternated between thuggery and the worst display of "ow my spleen" time-wasting I've ever seen.