ON this day 25 years ago: left-wing workers who had been on strike since June 1967 made an all-out effort to regain their jobs in government departments and public utility companies as well as private business firms. The sudden change, which might have the approval of higher authorities, was attributed to financial strain on the ''struggle fund'' as a reported $40 million which had been appropriated to pay the thousands of strikers full wages for almost a year seemedto have become exhausted. However, it was learned the government and most employers were prepared only to consider individual applications for positions where there were vacancies. The strikers were informed their strike pay would be ended and were told to regain their old jobs. Half of the reported $40 million was believed to have been remitted to the Hongkong strikers in the name of the All-China Federation of Trade Unions, whose chairman at the time was Mr Liu Ning-yi and who was among those purged as being opposed to Chairman Mao. Thus it was believed that the federation, without a leader, was unlikely to send left-wing unions in Hongkong any further financial support, and they were left with only the normal support of Beijing. THE Royal Hongkong Police had been asked by the US Federal Bureau of Investigation to be on the alert for an escaped convict who allegedly assassinated Dr Martin Luther King, the civil rights leader. The convict, James Earl Ray, an escapee from the Missouri State Penitentiary, was alleged to have shot Dr King in Memphis, Tennessee, on April 14.