Roman Catholic Bishops And Priests Who Came To Mexico To Discuss Matters In Connection With School For Training Of Mexican Young Men For Priesthood At Las Vegas, New Mexico. In Conversation With - Embassy Stressed Importance Of Americans' Abstaining From Any Word Or Act That Might Indicate Participation In Mexican Politics, And Warned That If Church Became Involved In Coming Political Campaign They Would Be Accused Of Trying To Impose Rule By "Foreign Imperialists".