The photos includes 张春桥（左起）、纪登奎、苏振华、李富春、聂荣臻、周建人. It was taken at the Working People's Palace of Culture (i.e. the Imperial Ancestral Hall). Source
Party leaders celebrate May Day in 1974
A collection: Shenyang in 1949
李富春、沈钧儒 Source
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Showing a Model of Anshan Iron and Steel to Foreign Guests in Beijing in 1954
In the photo are Li Fuchun (far right), Chairman of the National Federation of Trade Unions Lai Ruoyu (second on the right) and foreign guests. Source
Everyday Life in Mao's China 