Radical Reformists and Social Fighters for a Fairer Society (Dutch: Radicale Omvormers en Sociale Strijders voor een Eerlijker Maatschappij, ROSSEM) was a Belgian libertarian political party founded in 1991 by the Flemish businessman and writer Jean-Pierre Van Rossem.

There was an active French-speaking section in the Walloon Brabant with the acronym ROSSUM (Rassemblement omniprésent social et solidaire pour l'ubiquité des masses).

It scored surprisingly well for a non-mainstream party, achieving 3.2% of the vote which entitled it to three seats in the lower house and one in the senate.

The first was Waardig Ouder Worden [nl] in 1993, which joined the Vlaams Blok in 1999, it was led by Hendrik Boonen and Paul Verledens.

It is interesting to note that the anti-Van Rossem economically libertarian members of the party also grouped together in the Blanco list, led by Marcel Van der Vloet, that also participated in the 1995 elections.

Finally, in the rest of the municipalities where Rossem was present, the party never exceeded 1%: Bruges (0.94%), Deinze (0.82%), Ghent (0.81%), Sint-Niklaas (0.75%), Antwerp (0.75%) and Wemmel (0.35%).

WOW suffered a major electoral defeat that year leading to a merger with the Vlaams Blok alongside Blanco, BANAAN joined the new Vivant party and HOERA ceased to exist.

He also tried to create a joint list for the 2014 elections with the Workers' Party of Belgium and Libertair, Direct, Democratisch but they refused.