Frenchmen Seize Horses After 6 fix9NANTES, France, March 25 (UP)—French racing fans have long suspected many races were fixed, oiten betting on suspici-ns rather than horses themselves, but today fixers went too far.One jockey obviously reined in his horse to let.another from the same stable win. The crujvd set up a howl immediately. Tn~ judges announced ifcey wculdfine the jockey 500 francs (*4.10)for fraud. ~Further enraged by this official leniency, spectators swarm-ed onto the track and took possess! :n of the three winninghorses. Police squads arrived and straggled for an hour but failed to restrain the mob.Flnlly a downpour of ram discouraged them and they . returned drenched to the shelterof the grandstand.* _ _