It involves an unknown number of mainly Arab immigrants who were detained - many of them in New Jersey jails - after Sept. 11.
He took refuge in the substantial population of Turkish, African and Arab immigrants living in the blue-collar Harburg section surrounding the university.
Almost all the volunteers were Arab immigrants.
Street cleaners like him are ubiquitous in Paris - of the city's 38,000 employees, 4,500 are sweepers, most of them Arab or African immigrants.
The far-right National Front, in addition to its calls for expelling African and Arab immigrants, uses anti-Semitic rhetoric.
More recently, with racism on the rise in France, he has stood up for poor African and Arab immigrants.
The charter does not apply, though, to languages brought to the Continent by African or Arab immigrants.
They are joined by Chinese and Arab immigrants, the latter mostly from Palestine.
Sarrazin's findings on the failed integration of Turkish and Arab immigrants are beyond any doubt.
This was also true for the Chinese and Arab immigrants, majority of whom are also post WWII arrivals.