::::::Marx had no right to residency and the constitutional monarchy of Prussia had pressured Belgium to expel left-wing Germans.  Deportation of foreigners may have been entirely discretionary.  If so, Marx would have had no grounds for appeal.  The fact he was planning to leave anyway may have been reason not to appeal and maybe he could not afford a lawyer, having given all his money away.  BTW Wheen seems to be confused.  He quotes McLellan as saying "there was no evidence", then presents Jenny Marx's story as evidence.  But it is unlikely that the police took a statement from her before they arrested her husband.