Ralph Sarton Perry of Harvard University released yesterday the names of 93 prominent educators. churchmen. and individuals in other cultural fields. who have formed a committee of welcome for the Very Reverend Hewlett Johnson. D.D.. dean of Canterbury Cathedral. Dean Johnson had been invited to visit the United States by the National Council of AmericanSoviet Friendship for a countrywide tour under its auspices. A visa was refused him on the ground that the sponsoring organization was on the Attorney Generals list. The Committee of Welcome had extended to Dean Johnson an Invitation to come to the United States under its independent auspice in November and December of this year and to speak at public gatherings. The article named Dr.