[1] Politically speaking, Zenrō was tied closely to the Right Socialist Party (RSP), to whom it provided electoral support, and following the reunification of the Japan Socialist Party (JSP) in 1955, supported the former RSP factions in the new party, especially the far-right faction led by Suehiro Nishio.
[2] Although Zenrō generally shied away from political actions and even purely economic strikes, preferring a more conciliatory relationship with management, the federation did participate in the successful struggle in 1958 to defeat the revision of the Police Duties Bill proposed by conservative prime minister Nobusuke Kishi, which opponents were able to portray as less of a left-right issue and more of a basic threat to Japanese democracy and civil rights.
[3] However, Zenrō was less enthusiastic about supporting the 1960 Anpo protests against the US-Japan Security Treaty, and ultimately pulled out of the movement when the JSP insisted that the Japan Communist Party be allowed to participate.
Not that the left socialists and Sōhyō were necessarily sorry to see Zenrō and Nishio gone, as Zenrō had purchased Sōhyō's enmity by repeatedly attempting to hive off Zenrō-affiliated "second unions" within Sōhyō-controlled shop floors.
[4] In 1964, Zenrō merged with the National Council of Government and Public Workers' Unions (Zenkankō) and the Japanese Federation of Labour (Sōdōmei), to form the Japanese Confederation of Labour, better known as Dōmei.