Moscow--American church leaders visit the Tretiakov Gallery here during their ten-day stay in the Soviet Union. Shown in front row are, left to right: Dr. Roswell P. Barnes of New York, associate general secretary of the National Council of Churches; Charles C. Parlin of Englewood, N.J., a member of the National Council's general board; the Rt. Rev. Henry Knox Sherrill of New York, presiding bishop of the Episcopal Church; Dr. Eugene Carson Blake of Philadelphia, president of the National Council; Bishop D. Ward Nichols of New York, head of the African Methodist Episcopal Church's First Episcopal District; Paul B. Anderson of New York, secretary of the YMCA International Committee; and Dr. Franklin Clark Fry of New York, president of the United Lutheran Church in America.