Can a Catholic be denied communion for the way they want to receive Communion? I was at a gathering of group leaders for the Federation of North American Explorers, (a group operating under the FSE; a Vatican approved lay association of the faithful).  A leader from Quebec said that they were either denied communion or told to leave by a priest because they would only receive Communion on the tongue.  One of the rules of FNE is that members receive the Eucharist kneeling and on the tongue. 

Regardless of the plot holes in the above example (I should have asked more, but there was a bit of a language barrier), does a priest have the right to tell anyone to leave Mass (or deny them Communion) because of how they choose to receive?
Receiving the Communion on the tongue or kneeling is never a legal reason for denying Communion.
The instruction Redemptionis Sacramentum &quot;On certain matters to be observed or to be avoided regarding the Most Holy Eucharist&quot; of the Congregation for Divine Worship and the Discipline of the Sacraments deals with this topic [bold by me]:


In distributing Holy Communion it is to be remembered that “sacred ministers may not deny the sacraments to those who seek them in a reasonable manner, are rightly disposed, and are not prohibited by law from receiving them”.[177] Hence any baptized Catholic who is not prevented by law must be admitted to Holy Communion. Therefore, it is not licit to deny Holy Communion to any of Christ’s faithful solely on the grounds, for example, that the person wishes to receive the Eucharist kneeling or standing.

Although each of the faithful always has the right to receive Holy Communion on the tongue, at his choice,[178] if any communicant should wish to receive the Sacrament in the hand, in areas where the Bishops’ Conference with the recognitio of the Apostolic See has given permission, the sacred host is to be administered to him or her. However, special care should be taken to ensure that the host is consumed by the communicant in the presence of the minister, so that no one goes away carrying the Eucharistic species in his hand. If there is a risk of profanation, then Holy Communion should not be given in the hand to the faithful.[179]


[177] Code of Canon Law, can. 843 § 1; cf. can. 915.
[178] Cf. Missale Romanum, Institutio Generalis, n. 161.
[179] Congregation for Divine Worship and the Discipline of the Sacraments, Dubium: Notitiae 35 (1999) pp. 160-161.

This passage comes in a series of &quot;grave matters&quot; (n. 173). I think most Catholic will find some of these &quot;litugical abuses&quot; in their parish, so it does not mean the &quot;abuse&quot; is rare. That it is explicitly named means instead it happens (in some regions) often.
If - on the other hand - such a rule of FNE is legal, is another question and remains open.