I see no reason why acte should not be translated to "act", a term used widely to describe criminal behaviour

You say you do not want to hear that this means "disposal", but it can indeed mean just that. Rights in property/assets can be "disposed " of in a number of ways, as Jean-Marie points out in his reference post, including sale and gift, for example. "Disposition" covers various types of transfer is rights in property, but that does not make the term any the less specific.

You need to look to the appropriate Swiss definition and consider what options best suit your context. Although "acte" is not always best translated by "deed", it is often a good solution. That is likely to be the case here as rights in property are generally affected by deed.

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Note added at 23 hrs (2018-01-02 11:28:57 GMT)
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Juts an note to point out that you will find a number of hits for "deed of sale", "deed of gift", etc. but those are specific to the type of disposal or transfer. Your original is more wide-ranging. My suggestion is not the only solution here.

You may need to addapt this suggestion to suit your target reader (e.g. US, UK, etc.) and your context more generally.

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Note added at 23 hrs (2018-01-02 11:40:12 GMT)
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In fact, you will have gathered that "disposition" is not exceedingly vauge, indeed, it is not vague at all. A couple of Siwss sources to get you started:

http://www.lawscape.ch/doc/cc/possession.pdf

p.6 : "Un acte de disposition (acte par lequel le débiteur de
l’obligation de transférer ou de constituer un droit réel
manifeste sa volonté d’exécuter)"

p.7: "L’acte de disposition est une manifestation de
volonté de transférer la propriété, ceci suppose
que l’aliénateur dispose du bien en question."


https://www.admin.ch/opc/fr/classified-compilation/19070042/... and https://www.admin.ch/opc/en/classified-compilation/19070042/... where you can see that the term "disposal" is used in official Swiss sources in English.




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Note added at 1 day 4 hrs (2018-01-02 16:31:48 GMT)
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Interesting point made by AT, whose suggestion that this refers to the act of disposal itself adn not the documet by which a transfer of property may occur.

Searches show the use of "acte de disposition" meaning the document by which transfer of rights in assets may be made. That transfer can of course be fraudulent. The list in which the term appears makes AT's reading a strong contender, probalby the most logical. I'd like to find uses of the term for Switzerland with this application though.

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Note added at 1 day 4 hrs (2018-01-02 16:41:43 GMT)
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For "acte de disposition" in relation to "propriété" (to be read as title, ownerhip and not as "bien immobilier") : http://mcelegal.ch/upload/79_1.pdf, p10 in the body of the text : "Pour le transfert de propriété, un acte de disposition est en principe nécessaire en droit suisse, en plus d’un acte générateur d’obligation (la propriété ne s’acquiert pas par le seul effet des obligations). Ainsi, dans la logique juridique suisse, la stipulation pour autrui ne suffit pas à soi seule pour opérer le transfert de propriété : il faut encore qu’elle soit exécutée."



The second occurrence in this document of "disposition": http://www.fiduciaire-favre.ch/Documents/200303-fiscalite-tr...