Paul Mattick had a long political (and personal) relationship with the companion party in the US when he contributed to their journal Western Socialist.There may be some disagreements on the declining rate of profit and its consequence, different emphasis on parliament versus workers councils, but overall i think members consider Mattick (and his son, Paul Jnr) as comrades. My introduction to Mattick was his Anti-Bolshevik Communism. http://www.amazon.com/Anti-Bolshevik-Communism-Paul-Mattick-Jr/dp/0850362229/ref=la_B002887ZQY_1_3?s=books&ie=UTF8&qid=1386990764&sr=1-3His final book too is highly commended Marxism , the Last Refuge of the Bourgeoisie? (well the easier to read non-technical-economic Part 2)http://www.amazon.com/Marxism-Refuge-Bourgeoisie-Paul-Mattick/dp/0873322614/ref=la_B002887ZQY_1_1?s=books&ie=UTF8&qid=1386990764&sr=1-1
I always knew that Mattick had contributed book reviews to the Western Socialist – the former journal of the World Socialist Party of the United States – but I didn't realise how many. I just clicked through Mattick's Marxist Internet Archive page and between 1944-1958, he contributed about 19 or 20 (I lost count) separate reviews during that time.