In August 1941 he was recruited by Jacques Vaillant de Guélis to assist the Special Operations Executive SPINDLE Network in Cannes, having been recommended by Max Hymans.

In early 1942 he met Jean Moulin "Rex", envoy of General de Gaulle, who was parachuted in the evening of 1 January, and Peter Churchill, who arrived at his house on 10 January at the start of his first mission in France, and again on 21 April on his second mission when he brought two radio operators Isidore Newman «Julien» for the URCHIN network and Edward Zeff «Matthieu» for the SPRUCE network,[1] From April to July 1942 he hosted Maurice Pertschuk, a young officer of the SOE, future head of the Eugène-Prunus network in Toulouse and its region.

He helped numerous Resistance agents, including Emmanuel d'Astier de la Vigerie,[1] Yvon Morandat, Henri Frenay, and Philippe Roques.

He assisted many SOE agents, to whom he provided false documents when they arrived in France, or lodging them before their departure by submarine; some were radio operators;[1] others brought in funds for the Resistance.

In summer 1942 Lévy and his wife left Antibes and went into hiding near Lake Laffrey (Isère), where he remained in the Resistance in Lyon.

[2] As Soviet troops were advancing in January 1945, the camp was evacuated and the inmates were sent on a "death march" which lasted 52 days, during which about a quarter died.