International Socialist Alternative

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International Socialist Alternative

Predecessor	Committee for a Workers' International (1974)
Formation	1 February 2020
Type	Association of Trotskyist political parties
Headquarters	Hovenierstraat 45, 1080 Molenbeek, Brussels, Belgium
Region served	Worldwide
Membership	31 sections
Leader	Collective leadership
Website	internationalsocialist.net

International Socialist Alternative (ISA) is an international association of Trotskyist political parties. It claims group in 31 countries.

ISA was founded by sections on one side of a split in the Committee for a Workers' International (CWI).