The fonds consists of records pertaining to the NDP and CCF in B.C. Included are notices and agendas, minutes, correspondence, membership lists, financial records, policy, policy committees, maps, photographs, convention proceedings, geographical materials and constituency records. Also included are films and sound recordings.

The fonds reflects Winch's various interests in the cause of humanity ranging from capital punishment to the protection of fur-bearing animals. The files also contain much valuable information on the activities of the C.C.F. and his role within the party. To a lesser extent, the files contain information on his earlier activities within the labour movement and events during the depression of the 1930's.