Six people arrested over an alleged sham marriage network have been charged with a variety of offences.
Police arrested a total of nine people on Tuesday in raids on homes in north London and at a register office.
Two men and a woman are due before Croydon magistrates on Thursday and three other people are due at the same court next week, the Home Office said.
A spokesman said two women arrested at Enfield addresses had been bailed pending further inquiries.
A Dutch man arrested at the register office has been charged with conspiring to commit perjury and attempting to assist a breach of UK immigration laws.
A Nigerian woman also arrested at the register office was charged with conspiring to commit perjury and seeking avoidance or postponement of enforcement action by deception.
The pair, along with a man arrested outside the office who was charged with two counts of conspiracy to defraud the Home Secretary, are all due in court on Thursday, the Home Office spokesman said.
The Home office said a man and woman arrested at one of the Enfield houses had been charged with conspiracy to defraud the home secretary.
A third person, a Nigerian, also arrested at one of the houses has been charged with two counts of conspiracy to defraud the home secretary.
A suspected immigration offender, also arrested in connection with the investigation, is being detained by the Immigration Service, the spokesman said.
Conspiracy to defraud the home secretary carried a maximum prison sentence of 10 years.