On 16 June, the POUM was made illegal, accused of collaborating with the enemy. Its leaders were arrested and Andreu Nin murdered. ILP leader John McNair arrived in Barcelona on 18 June with money and documents to organise the evacuation of the ILP contingent and was promptly arrested as a "POUM agent" but was released when he had proven his identity. He then went into hiding with Orwell and Cottman and managed to leave the country. Most of the rest of the contingent returned to Britain over the next six months.